SGP/SIROS/E15 - occasional spikes in readings

Since installation of this SIROS site to the dates specified, negative spikes
occurred in the data streams indicated, especially for down_short_hemisp and
down_long_diffuse_hemisp.  These spikes were induced by electrical interference from the
fence that was used to keep out cattle.  The spikes were eliminated by moving
the fence further away from the SIROS sensors in October 1994.  An assessment
by Mike Splitt on the effects of the spikes indicated that the spikes
superimposed on the readings ranged from -10 to -100 W m^-2.  As many as 40 per
day could occur.  As a result of these spikes, the daily average reading of
irradiance could be reduced by as much as 1 W m^-2, a half-hour average could be
reduced by as much as 2 W m^-2, and a 5-min average could be affected by as much
as 5 W m^-2.

• Development raw data stream - documentation not supported

• down_long_diffuse_hemisp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

SGP/SIROS/E1 - wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for
broadband irradiance as 'watts per square meter' (W/M^2).  
However, the
 units are really 'counts'.  The fields affected 
are SIROS:
   'hemisp_broadband:units'
   'diffuse_hemisp_broadband:units'
   'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was
corrected by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed
P960229.2)

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

SGP/SIROS/E11 - wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for
broadband irradiance as 'watts per square meter' (W/M^2).  
However, the
 units are really 'counts'.  The fields affected 
are SIROS:
   'hemisp_broadband:units'
   'diffuse_hemisp_broadband:units'
   'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was
corrected by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed
P960229.2)

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• hemisp_broadband
• diffuse_hemisp_broadband

SGP/SIROS/E15 - wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for
broadband irradiance as 'watts per square meter' (W/M^2).  
However, the
 units are really 'counts'.  The fields affected 
are SIROS:
   'hemisp_broadband:units'
   'diffuse_hemisp_broadband:units'
   'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was
corrected by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed
P960229.2)

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• hemisp_broadband
• diffuse_hemisp_broadband

SGP/SIROS/E16 - wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for
broadband irradiance as 'watts per square meter' (W/M^2).  
However, the
 units are really 'counts'.  The fields affected 
are SIROS:
   'hemisp_broadband:units'
   'diffuse_hemisp_broadband:units'
   'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was
corrected by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed
P960229.2)

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• hemisp_broadband
• diffuse_hemisp_broadband

SGP/SIROS/E24 - wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for
broadband irradiance as 'watts per square meter' (W/M^2).  
However, the
 units are really 'counts'.  The fields affected 
are SIROS:
   'hemisp_broadband:units'
   'diffuse_hemisp_broadband:units'
   'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was
corrected by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed
P960229.2)

• diffuse_hemisp_broadband
• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)

Installation of new data logger PROM

DQR No:                               Platform: sgpsirosE15

Subject: Installation of new data logger PROM

Date Submitted: 95/03/27
Submitted By: Nels Larson             _X_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other _____________________________

For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at dqr@arm.gov.

Platform/Measurement: All data
	What level data: (raw,a0,a1,b1,c1 etc): All

    What location was the data collected at: Ringwood

    Period of time in question
 	Begin Date  95/03/08   Time   17:14    (GMT)
 	End Date    95/03/08   Time   22:59    (GMT)

 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 _X_  incorrect                         ___  Only some data fields affected
 ___  wrong calibration
 ___  others 

 Discussion of Problem:

The MFRSR head for sgpmsirosE15 was changed by the mentors. The old head, 924,
was removed for recalibration, and the new head, 230, was installed.
No data was acquired between 95/03/08 17:14-18:39.
The data logger PROM was upgraded from Version 12 to Version 13.
Data logger flags in the comm program were incorrect during the period
95/03/08 18:39-22:59 and all data during that interval are no good.

Other observations/measurements impacted by this problem:

The data logger clock lost 17 seconds per day after the PROM upgrade until
reset with a new clock constant at 95/03/16 05:18.

Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)


Data Processing Notes                Date

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• logger_volt
• base_time
• diffuse_hemisp_broadband
• flag_ln_error1-24
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lat
• logger_temp
• up_long_case_temp
• channel
• hemisp_broadband
• down_long_diffuse_hemisp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• flag_zero_divisor1-24
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• therm_volt
• down_long_case_temp
• mfrsr_temp
• lon
• diffuse_hemisp_narrowband
• flag_zero_cosine1-24
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_nighttime1-24
• time_offset
• up_long_dome_temp
• alt
• down_long_dome_temp
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)

MFRSR out of alignment

DQR No:                               Platform: MFRSR

Subject: E24 - MFRSR out of alignment

Date Submitted: 1 Feb 1996
Submitted By: Jim Barnard             _X_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other _____________________________
 
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at problems@arm.gov.

Platform/Measurement:
        What level data: (raw,a0,a1,b1,c1 etc): a1

    What location was the data collected at: 
 
    Period of time in question
        Begin Date   95/11/07  Time   00:00    (GMT)
        End Date      /  /     Time     :      (GMT) - ongoing problem

 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 _x_  incorrect                         _x_  Only some data fields affected
 ___  wrong calibration
 ___  others 
 
 Discussion of Problem: The shadowband of the MFRSR is not fully
shading the detector head.  During the morning hours, this partial
shading causes some data to have a "saw tooth" pattern; these data are
clearly bad.  The direct normal and diffuse irradiances are subject to
this problem, however, the total downwelling irradiance is OK.  In the
afternoon, all the data fields appear to be correct.




 
Other observations/measurements impacted by this problem:



Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)

align MFRSR (this is much harder than it seems because of logistical problems -
the technicians have to be at the site on a clear day at solar noon to do
the alignment )

• diffuse_hemisp_broadband
• diffuse_hemisp_narrowband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)

ONgoing Data Quality Problems

(NOTE: THIS DQR REPLACES P960327.1 SUBMITTED EARLIER)
----------------------------------------------------
Date Submitted: 1 April 1996
Submitted By: Jim Barnard             _X_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other _____________________________
 
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at problems@arm.gov.

Platform/Measurement:
        What level data: (raw,a0,a1,b1,c1 etc): a1

    What location was the data collected at: 
 
    Period of time in question
        Begin Date   96/03/07  Time   00:00    (GMT)
        End Date     96/03/21  Time   21:30    (GMT)
        (For the NIP, some errors are occasionally observed
         after the "End Date"). 

 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 _x_  incorrect                         _x_  Only some data fields affected
 ___  wrong calibration
 ___  others 
 
 Discussion of Problem: Data has been collected at site E2 since
about March 7, 1996. From this date to about March 21, 1996, the signal
from both IR pyrgeometers (both upwelling and downwelling) is bad. 
Additionally, the signal from the NIP and the upwelling SW sensor is
likewise bad.  After March 21, 1996 these instruments were repaired
although the status of the NIP is still unclear.  After this date, the NIP
has been observed to suddenly emit a signal that is far too high.  After a
few hours, the signal suddenly drops back to its proper value.  These 
excursions are rare, however the data user should be mindful of them.
 
Other observations/measurements impacted by this problem:



Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• base_time
• up_long_dome_temp
• diffuse_hemisp_broadband
• down_long_diffuse_hemisp
• therm_volt
• lat
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_zero_divisor1-24
• flag_nighttime1-24
• lon
• logger_volt
• down_long_case_temp
• down_long_dome_temp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• flag_zero_cosine1-24
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• hemisp_broadband
• logger_temp
• channel
• diffuse_hemisp_narrowband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• up_long_case_temp
• alt
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• flag_ln_error1-24

Unshaded PSP dirty domes

Subject: Unshaded PSP dirty domes

Platform/Measurement: sgpsiros/unshaded PSP

What location was the data collected at: E8, E11                                

Period of time in question
        Begin Date  03/21/96 
        End Date    04/02/96 

Discussion of Problem:
 
   Large differences between estimates of downwelling hemispheric
   shortwave radiation from the unshaded PSP and the combination
   of the NIP and shaded PSP were observed as early as March 21,
   1996 and lasted through April 2, 1996 when Site Operations
   cleaned the radiometer domes at E8.  The differences were as
   high as 150 W/m^2 during the late afternoon on several days
   within this period. The cause of the differences seems to be
   dirt on the unshaded PSP dome (which was observed before the
   dome was cleaned) causing the estimate from the unshaded PSP
   to be lower than expected.  The dome condition observation
   was obtained by email communication with Site Operatons
   staff and is not know to be logged elsewhere.

   Differences in the downwelling hemispheric shortwave estimates
   at E11 (though not nearly as large as at E8) showed improvement
   after dome cleaning activities on April 2, as well.

   A postscript file attachment depicts the data for E8 on 
   April 2 and the cleaning of the dome can be identified at the time:
   Day of Year 93.82, or at about 1930Z.

• flag_ln_error1-24
• alt
• flag_zero_cosine1-24
• down_long_dome_temp
• therm_volt
• diffuse_hemisp_broadband
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• logger_temp
• base_time
• hemisp_broadband
• lon
• down_long_case_temp
• diffuse_hemisp_narrowband
• time_offset
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• flag_zero_divisor1-24
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• up_long_case_temp
• down_long_diffuse_hemisp
• lat
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• mfrsr_temp
• logger_volt
• hemisp_narrowband
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

• time_offset
• alt
• base_time
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• hemisp_broadband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• logger_temp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• diffuse_hemisp_broadband
• up_long_dome_temp
• flag_zero_cosine1-24
• flag_zero_divisor1-24
• flag_nighttime1-24
• logger_volt
• lat
• channel
• therm_volt
• hemisp_narrowband
• down_long_case_temp
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_ln_error1-24
• up_long_case_temp
• diffuse_hemisp_narrowband
• down_long_diffuse_hemisp
• mfrsr_temp
• lon
• down_long_dome_temp

SGP/SIROS/E1 - Wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for broadband irradiance as 
'watts per square meter' (W/m^2). However, the units are really 'counts'. 
The fields affected are SIROS:  
'hemisp_broadband:units'
'diffuse_hemisp_broadband:units'
'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was corrected 
by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed P960229.2)

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

SGP/SIROS/E15 - Wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for broadband irradiance as 
'watts per square meter' (W/m^2). However, the units are really 'counts'. 
The fields affected are SIROS:  
'hemisp_broadband:units'
'diffuse_hemisp_broadband:units'
'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was corrected 
by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed P960229.2) 
----------------------------------------

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• hemisp_broadband
• diffuse_hemisp_broadband

SGP/SIROS/E16 - Wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for broadband irradiance as 
'watts per square meter' (W/m^2). However, the units are really 'counts'. 
The fields affected are SIROS:  
'hemisp_broadband:units'
'diffuse_hemisp_broadband:units'
'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was corrected 
by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed P960229.2) 
----------------------------------------

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• hemisp_broadband
• diffuse_hemisp_broadband

SGP/SIROS/E24 - Wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for broadband irradiance as 
'watts per square meter' (W/m^2). However, the units are really 'counts'. 
The fields affected are SIROS:  
'hemisp_broadband:units'
'diffuse_hemisp_broadband:units'
'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was corrected 
by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed P960229.2) 
----------------------------------------

• diffuse_hemisp_broadband
• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)

SGP/SIROS/E11 - Wrong units for broadband irradiance

Headers for SIROS, MFR25m and MFR10m give the units for broadband irradiance as 
'watts per square meter' (W/m^2). However, the units are really 'counts'. 
The fields affected are SIROS:  
'hemisp_broadband:units'
'diffuse_hemisp_broadband:units'
'direct_norm_broadband:units'
MFR:
'mfr_up_hemisp_broadband:units'

This problem has existed since the beginning of the data streams, and was corrected 
by Jeff Slater on 1/23/96 (see C960314.2 by Ken Yates that closed P960229.2)

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• hemisp_broadband
• diffuse_hemisp_broadband

SGP/SIROS - wrong units for broadband irradiance

Headers for SIROS, give the units for broadband irradiance as 'watts per square meter' 
(w/m^2).  However, the units are really 'counts'.  The fields affected are:
'hemisp_broadband:units'
'diffuse_hemisp_broadband:units'
'direct_norm_broadband:units'

This problem existed since the beginning of the data streams, and was
corrected on 1/23/96.

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• hemisp_broadband
• diffuse_hemisp_broadband

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

• hemisp_broadband
• diffuse_hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

• hemisp_broadband
• diffuse_hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband
• hemisp_broadband

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband
• hemisp_broadband

• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband

• diffuse_hemisp_broadband
• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)

• diffuse_hemisp_broadband
• hemisp_broadband
• Direct Normal Broadband Irradiance(direct_norm_broadband)

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband
• hemisp_broadband

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband
• hemisp_broadband

NIP (pyrheliometer) calibration coefficient slightly wrong

DQR No:                               Platform: SIROS

Subject: Site E2 - NIP (pyrheliometer) calibration coefficient
slightly wrong for a period of 5 days

Date Submitted: 1 May 1996
Submitted By: Jim Barnard             _X_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other _____________________________
 
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at problems@arm.gov.

Platform/Measurement:
        What level data: (raw,a0,a1,b1,c1 etc): a1

    What location was the data collected at: 
 
    Period of time in question
        Begin Date   96/04/19  Time   15:20    (GMT)
        End Date     96/04/24  Time   00:00    (GMT)
        (For the NIP, some errors are occasionally observed after the "End Date").

Data should be labeled:
 ___  questionable                      ___  All data fields affected
 ___  incorrect                         _x_  Only some data fields affected
 _x_  wrong calibration
 ___  others 
 

 Discussion of Problem:  The NIP (pyrheliometer) at site E2 was changed
on April 19, 1996 at about 1530 GMT.  When the NIP was changed, the data
ingest was not turned off and continued insouciantly.  Later, the mentor 
was informed about the change and a new calibration file was submitted.
This file was applied to the ingested data about April 24, 1996.
Instead of redoing the ingest from April 19, 1996 to April 24, 1996,
we are submitting this DQR to inform people that the NIP calibration 
during this time period is not correct.  The calibration factor
applied to these data during this period is 8.513 x 10^-6 Volts/W/M^2,
while the true calibration factor is 8.546 x 10^-6 Volts/W/M^2.  This
factor is being applied to all the NIP data collected from April 24, 1996
on.  Note that the error caused by using the incorrect calibration
factor is less than 0.4%. 




Other observations/measurements impacted by this problem:



Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.)

The error is so small that it can probably be ignored; from a
practical standpoint, this DQR is submitted for the sake of
completeness.

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• base_time
• up_long_dome_temp
• diffuse_hemisp_broadband
• down_long_diffuse_hemisp
• therm_volt
• lat
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_zero_divisor1-24
• flag_nighttime1-24
• lon
• logger_volt
• down_long_case_temp
• down_long_dome_temp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• flag_zero_cosine1-24
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• hemisp_broadband
• logger_temp
• channel
• diffuse_hemisp_narrowband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• up_long_case_temp
• alt
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• flag_ln_error1-24

MFRSR out of alignment

DQR

Date Submitted: 10 May 1996
Submitted By: Jim Barnard             _X_  Instrument Mentor
                                      ___  EST Member
                                      ___  Science Team Member
                                      ___  Other _____________________________
 
For questions or problems, please contact the ARM Experiment Center at
509-375-6898 or via email at problems@arm.gov.

Platform/Measurement:
        What level data: (raw,a0,a1,b1,c1 etc): raw,a0,a1

    What location was the data collected at: E1
 
    Period of time in question
        Begin Date   about 96/04/06  
        End Date     ongoing problem  


 Data should be labeled:
 ___  questionable                      ___  All data fields affected
 _x_  incorrect                         _x_  Only some data fields affected
 ___  wrong calibration
 ___  others 
 
 Discussion of Problem: The MFRSR at site E1 has been grossly out of alignment
from about 96/04/06 to the present time.  This is an ongoing problem.  The poor
alignment manifests itself in a sawtooth pattern in the direct beam and diffuse
components of the MFRSR data.  During the time this pattern exists, the data
are almost useless.
 
Other observations/measurements impacted by this problem:



Suggested Corrections of the Problem: (e.g. change calibration factor and
recompute, flag data with this comment, etc.): align instument at
earliest possible time (Logistically, this is harder than it seems at
first glance).

• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_narrowband
• diffuse_hemisp_broadband

MFRSR out of alignment

DATA QUALITY REPORT (DQR)

                   DQR No: P960608.2

o Date Submitted: 8 June 1996

o Submitted By:    Jim Barnard
     Organization- PNNL
        Telephone- (509) 372-6145
    Email Address- jc_barnard@pnl.gov

o Subject: sgp.sirosE16.960604xxxx.xxxxxxxxxx. - E16 MFRSR out of alignment

o Data should be labeled: incorrect

o Description: The MFRSR at E16 is out of alignment.  This poor alignment 
affects the direct beam and diffuse radiation measurements taken during 
the afternoon. There's also some evidence that the alignment affected data 
taken during the morning hours on 05/21/96.  It's hard to diagnose a 
misalignment problem during cloudy or partly cloudy weather, so the data 
user should beware of all the data taken from about 5/20/96 onward (until 
the instrument is aligned).                     

o Suggested Corrections: align instrument

• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• alt
• logger_volt
• flag_zero_cosine1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• hemisp_broadband
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• logger_temp
• lon
• up_long_case_temp
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_ln_error1-24
• down_long_case_temp
• down_long_dome_temp
• diffuse_hemisp_broadband
• time_offset
• base_time
• flag_zero_divisor1-24
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lat
• diffuse_hemisp_narrowband
• therm_volt
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• down_long_diffuse_hemisp

MFRSR out of alignment

DATA QUALITY REPORT (DQR)

                   DQR No: P960608.3

o Date Submitted: 8 June 1996

o Submitted By:    Jim Barnard
     Organization- PNNL
        Telephone- (509) 372-6145
    Email Address- jc_barnard@pnl.gov

o Subject: sgp.sirosE11.960520xxxx.xxxxxxxxxx. - E11 MFRSR out of alignment

o Data should be labeled: 

o Description: The MFRSR at site E11 is out of alignment.  The poor alignment 
affects data (direct beam and diffuse radiation only) taken during the 
afternoon hours.                                            

o Suggested Corrections: align instrument

• flag_ln_error1-24
• alt
• flag_zero_cosine1-24
• down_long_dome_temp
• therm_volt
• diffuse_hemisp_broadband
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• up_long_case_temp
• down_long_diffuse_hemisp
• logger_temp
• base_time
• lat
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• hemisp_broadband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lon
• down_long_case_temp
• diffuse_hemisp_narrowband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• mfrsr_temp
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• logger_volt
• flag_zero_divisor1-24
• hemisp_narrowband
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

MFRSR out of alignment

The MFRSR at site E24 is out of alignment.  The instrument has been
out of alignment since about 11/08/95.  From about 03/08/96 to 04/15/96
the instrument appeared to be well aligned.  After 4/15/96 the alignment
problem was again noticeable. (The instrument can be permanently out of alignment
but still work well during some parts of the year).  The poor alignment
only affects the direct beam and diffuse data streams.  The alignment problem
was particularly severe during the first part of June.  On 06/05/96, it
appears that an effort was made to solve the problem, with some
success, but the problem still persists, albiet it has been
significantly reduced (the data is still bad, however).

• flag_zero_divisor1-24
• down_long_dome_temp
• down_long_diffuse_hemisp
• base_time
• logger_volt
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• channel
• logger_temp
• lat
• up_long_dome_temp
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• flag_ln_error1-24
• down_long_case_temp
• up_long_case_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• hemisp_broadband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• lon
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• diffuse_hemisp_broadband
• flag_nighttime1-24
• alt
• time_offset
• diffuse_hemisp_narrowband
• mfrsr_temp
• hemisp_narrowband
• therm_volt
• flag_zero_cosine1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)

time stamp error

The internal code that runs the MFRSR data logger
had a bug that occasionally caused the time stamp associated with the data to
be slightly in error.  This error is thought to be very small (say less than
30 seconds) and very infrequent.  (Unfortunately, we cannot give firm
estimates of the magnitude and frequency of the error). 

After 96/07/24 the problem was corrected.  Those who use the data before this
time should realize that the time stamp for each record of data might be
slightly in error.

• down_long_dome_temp
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband
• down_long_case_temp
• lon
• alt
• hemisp_narrowband
• mfrsr_temp
• up_long_case_temp
• flag_nighttime1-24
• diffuse_hemisp_narrowband
• lat
• therm_volt
• hemisp_broadband
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• up_long_dome_temp
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• down_long_diffuse_hemisp
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• flag_ln_error1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• flag_zero_cosine1-24
• time_offset
• channel
• logger_temp
• logger_volt
• base_time
• flag_zero_divisor1-24

time stamp error

The internal code that runs the MFRSR data logger
had a bug that occasionally caused the time stamp associated with the data to
be slightly in error.  This error is thought to be very small (say less than
30 seconds) and very infrequent.  (Unfortunately, we cannot give firm
estimates of the magnitude and frequency of the error). 

After 96/08/09 the problem was corrected.  Those who use the data before this
time should realize that the time stamp for each record of data might be
slightly in error.

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• base_time
• up_long_dome_temp
• diffuse_hemisp_broadband
• down_long_diffuse_hemisp
• therm_volt
• lat
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_zero_divisor1-24
• flag_nighttime1-24
• lon
• logger_volt
• down_long_case_temp
• down_long_dome_temp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• flag_zero_cosine1-24
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• hemisp_broadband
• logger_temp
• channel
• diffuse_hemisp_narrowband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• up_long_case_temp
• alt
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• flag_ln_error1-24

time stamp error

The internal code that runs the MFRSR data logger
had a bug that occasionally caused the time stamp associated with the data to
be slightly in error.  This error is thought to be very small (say less than
30 seconds) and very infrequent.  (Unfortunately, we cannot give firm
estimates of the magnitude and frequency of the error). 

After 96/08/29 the problem was corrected.  Those who use the data before this
time should realize that the time stamp for each record of data might be
slightly in error.

• flag_zero_divisor1-24
• down_long_dome_temp
• down_long_diffuse_hemisp
• base_time
• logger_volt
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• channel
• logger_temp
• lat
• up_long_dome_temp
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• flag_ln_error1-24
• down_long_case_temp
• up_long_case_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• hemisp_broadband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• lon
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• diffuse_hemisp_broadband
• flag_nighttime1-24
• alt
• time_offset
• diffuse_hemisp_narrowband
• mfrsr_temp
• hemisp_narrowband
• therm_volt
• flag_zero_cosine1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)

time stamp error

The internal code that runs the MFRSR data logger
had a bug that occasionally caused the time stamp associated with the data to
be slightly in error.  This error is thought to be very small (say less than
30 seconds) and very infrequent.  (Unfortunately, we cannot give firm
estimates of the magnitude and frequency of the error). 

After 96/08/20 the problem was corrected.  Those who use the data before this
time should realize that the time stamp for each record of data might be
slightly in error.

• flag_ln_error1-24
• alt
• flag_zero_cosine1-24
• down_long_dome_temp
• therm_volt
• diffuse_hemisp_broadband
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• up_long_case_temp
• down_long_diffuse_hemisp
• logger_temp
• base_time
• lat
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• hemisp_broadband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lon
• down_long_case_temp
• diffuse_hemisp_narrowband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• mfrsr_temp
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• logger_volt
• flag_zero_divisor1-24
• hemisp_narrowband
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

time stamp error

The internal code that runs the MFRSR data logger
had a bug that occasionally caused the time stamp associated with the data to
be slightly in error.  This error is thought to be very small (say less than
30 seconds) and very infrequent.  (Unfortunately, we cannot give firm
estimates of the magnitude and frequency of the error). 

After 96/07/16 the problem was corrected.  Those who use the data before this
time should realize that the time stamp for each record of data might be
slightly in error.

• Direct Normal Broadband Irradiance(direct_norm_broadband)
• logger_volt
• base_time
• diffuse_hemisp_broadband
• flag_ln_error1-24
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lat
• logger_temp
• up_long_case_temp
• channel
• hemisp_broadband
• down_long_diffuse_hemisp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• flag_zero_divisor1-24
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• therm_volt
• down_long_case_temp
• mfrsr_temp
• lon
• diffuse_hemisp_narrowband
• flag_zero_cosine1-24
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_nighttime1-24
• time_offset
• up_long_dome_temp
• alt
• down_long_dome_temp
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)

time stamp error

The internal code that runs the MFRSR data logger
had a bug that occasionally caused the time stamp associated with the data to
be slightly in error.  This error is thought to be very small (say less than
30 seconds) and very infrequent.  (Unfortunately, we cannot give firm
estimates of the magnitude and frequency of the error). 

After 96/07/19 the problem was corrected.  Those who use the data before this
time should realize that the time stamp for each record of data might be
slightly in error.

• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• alt
• logger_volt
• flag_zero_cosine1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• hemisp_broadband
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• logger_temp
• lon
• up_long_case_temp
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_ln_error1-24
• down_long_case_temp
• down_long_dome_temp
• diffuse_hemisp_broadband
• time_offset
• base_time
• flag_zero_divisor1-24
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lat
• diffuse_hemisp_narrowband
• therm_volt
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• down_long_diffuse_hemisp

MFRSR out of alignment - E16

From about 96/07/19 to about 96/11/25, the MFRSR was out of alignment at
site E16.  (It's not possible to exactly pin down the beginning and ending
dates of the alignment problem because of weather conditions.  Also, the
alignment problem could recur later on)  The misalignment affects data 
taken during the afternoon.

• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• alt
• logger_volt
• flag_zero_cosine1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• hemisp_broadband
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• logger_temp
• lon
• up_long_case_temp
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_ln_error1-24
• down_long_case_temp
• down_long_dome_temp
• diffuse_hemisp_broadband
• time_offset
• base_time
• flag_zero_divisor1-24
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lat
• diffuse_hemisp_narrowband
• therm_volt
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• down_long_diffuse_hemisp

MFRSR out of alignment

From 96/12/31/ to 97/01/15 the MFRSR site E24 was out of alignment. The
poor alignment is manifested, by the sawtooth pattern that occurs in the
direct and diffuse data; this pattern is particularly evident during the
time about local noon.

• flag_zero_divisor1-24
• down_long_dome_temp
• down_long_diffuse_hemisp
• base_time
• logger_volt
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• channel
• logger_temp
• lat
• up_long_dome_temp
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• flag_ln_error1-24
• down_long_case_temp
• up_long_case_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• hemisp_broadband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• lon
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• diffuse_hemisp_broadband
• flag_nighttime1-24
• alt
• time_offset
• diffuse_hemisp_narrowband
• mfrsr_temp
• hemisp_narrowband
• therm_volt
• flag_zero_cosine1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)

solar tracker inoperative

From about 97/02/20 to 97/03/06 (1500 GMT) the solar tracker was inoperative
at site E2.  We cannot pin down the exact starting time of this failure
because of cloudy conditions around 97/02/20.  The failure becomes obvious
during clear skis at which time the NIP reads zero (i.e., it isn't pointed
at the sun) and the downward diffuse radiation is too large (because the
diffuse pyranometer is not being shaded).  97/03/03 was a particularly 
clear day and the diffuse pyranometer reads almost the same as the total
downward pyranometer.  The fact that they don't read exactly the same - the
discrepency is about 75 W/m^2 at solar noon - is indicative of a large sensor
calibration problem.  This large calibration error is NOT typical of ARM 
data, rather it is peculiar to this site.

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• base_time
• up_long_dome_temp
• diffuse_hemisp_broadband
• down_long_diffuse_hemisp
• therm_volt
• lat
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_zero_divisor1-24
• flag_nighttime1-24
• lon
• logger_volt
• down_long_case_temp
• down_long_dome_temp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• flag_zero_cosine1-24
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• hemisp_broadband
• logger_temp
• channel
• diffuse_hemisp_narrowband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• up_long_case_temp
• alt
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• flag_ln_error1-24

solar tracker inoperative

At site E11 the solar tracker was inoperative from about 970325 to about
970330 (1830 GMT).  The exact time at which tracker failed is not known
because of weather conditions.

• flag_ln_error1-24
• alt
• flag_zero_cosine1-24
• down_long_dome_temp
• therm_volt
• diffuse_hemisp_broadband
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• up_long_case_temp
• down_long_diffuse_hemisp
• logger_temp
• base_time
• lat
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• hemisp_broadband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lon
• down_long_case_temp
• diffuse_hemisp_narrowband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• mfrsr_temp
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• logger_volt
• flag_zero_divisor1-24
• hemisp_narrowband
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

Data Missing due to HW/Communications Problems

Between 4/3 and 4/9 only 1-5% expected data volume where collected 
from the SIROS at E16 (Vici).  Site maintenance found the system 
inoperable 4/9 and power-cycled.

• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• alt
• logger_volt
• flag_zero_cosine1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• hemisp_broadband
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• logger_temp
• lon
• up_long_case_temp
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_ln_error1-24
• down_long_case_temp
• down_long_dome_temp
• diffuse_hemisp_broadband
• time_offset
• base_time
• flag_zero_divisor1-24
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lat
• diffuse_hemisp_narrowband
• therm_volt
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• down_long_diffuse_hemisp

solar tracker inoperative

On about 97/04/12 the solar tracker at site E2 stopped working.  The
solar tracker exhibits its broken state in a particular striking fashion on 97/04/14 - an 
almost
cloud-free day.  On this day, the NIP reads zero and the diffuse and
direct SW radiation are about the same.  The fact that these two data steams
are not exactly the same indicates a calibration problem - probably with
the diffuse instrument.  This poor calibration is not typical of other
ARM sites!  On about 97/04/17 (1400 GMT) the solar tracker was fixed.

(Note: we cannot pinpoint the exact time or date when the solar tracker
went out and the date quoted above {97/04/12} should be regarded
as approximate)

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• mfrsr_temp
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• base_time
• up_long_dome_temp
• diffuse_hemisp_broadband
• down_long_diffuse_hemisp
• therm_volt
• lat
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• flag_zero_divisor1-24
• flag_nighttime1-24
• lon
• logger_volt
• down_long_case_temp
• down_long_dome_temp
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• hemisp_narrowband
• flag_zero_cosine1-24
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• hemisp_broadband
• logger_temp
• channel
• diffuse_hemisp_narrowband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• up_long_case_temp
• alt
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• flag_ln_error1-24

E1 NIP affected by precipitation

Comparison of the dowelling hemishperic solar broadband flux estimated
from the unshaded PSP (down_short_hemisp) and that derived from the 
combination of the NIP (short_direct_normal) and shaded PSP
(down_short_diffuse_hemisp) showed significant differences (greater
than 60 W/m^2) at times on June 23, 1997. These differences appear
to be due to questionable data from the NIP (short_direct_normal) that
may have been caused by rainfall on that day. The NIP values recorded 
values as low as -25 W/m^2 in proximity to when the SMOS recorded 
precipitation. After the first precipitation event, the NIP appeared
to be recording lower values during sunnier periods that may be due 
to collected precipitation in the NIP affecting the amount of solar 
radiation reaching the sensor

• down_long_dome_temp
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• diffuse_hemisp_broadband
• down_long_case_temp
• lon
• alt
• hemisp_narrowband
• mfrsr_temp
• up_long_case_temp
• flag_nighttime1-24
• diffuse_hemisp_narrowband
• lat
• therm_volt
• hemisp_broadband
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• up_long_dome_temp
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• down_long_diffuse_hemisp
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• flag_ln_error1-24
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• flag_zero_cosine1-24
• time_offset
• channel
• logger_temp
• logger_volt
• base_time
• flag_zero_divisor1-24

E11 NIP affected by precipitation

Comparison of the dowelling hemishperic solar broadband flux estimated
from the unshaded PSP (down_short_hemisp) and that derived from the 
combination of the NIP (short_direct_normal) and shaded PSP
(down_short_diffuse_hemisp) showed significant differences (greater
than 70 W/m^2) at times on June 23, 1997. These differences appear
to be due to questionable data from the NIP (short_direct_normal) that
may have been caused by rainfall on that day. The NIP values recorded 
values as low as -14 W/m^2 in proximity to when the SMOS recorded 
precipitation. After the first precipitation event, the NIP appeared
to be recording lower values during sunnier periods that may be due 
to collected precipitation in the NIP affecting the amount of solar 
radiation reaching the sensor

• flag_ln_error1-24
• alt
• flag_zero_cosine1-24
• down_long_dome_temp
• therm_volt
• diffuse_hemisp_broadband
• up_long_dome_temp
• flag_nighttime1-24
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• up_long_case_temp
• down_long_diffuse_hemisp
• logger_temp
• base_time
• lat
• channel
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• hemisp_broadband
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• lon
• down_long_case_temp
• diffuse_hemisp_narrowband
• Direct Normal Broadband Irradiance(direct_norm_broadband)
• time_offset
• mfrsr_temp
• Direct Normal Irradiance, NIMFR(direct_norm_narrowband)
• logger_volt
• flag_zero_divisor1-24
• hemisp_narrowband
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)