Data Quality Reports for Session: 134739 User: dmfoper Completed: 05/09/2011

TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D010423.10SGP/SIRS/E9 - Diffuse Pyranometer Thermal OffsetssgpsirsE9.a0, sgpsirsE9.a1
D010423.8SGP/SIRS/E7 - Diffuse Pyranometer Thermal OffsetssgpsirsE7.a0, sgpsirsE7.a1
D010423.9SGP/SIRS/E8 - Diffuse Pyranometer Thermal OffsetssgpsirsE8.a0, sgpsirsE8.a1
D010430.11SGP/SIRS/E7 - Tracking ProblemssgpsirsE7.a1
D020619.2SGP/SIRS/E7 - April 1999 Quality ReviewsgpsirsE7.a0, sgpsirsE7.a1
D020909.3SGP/SIRS/E8 - Solar Tracker FailuresgpsirsE8.a1
D031124.2SGP/SIRS/E8 -sgpsirsE8.a0, sgpsirsE8.a1
D031124.3SGP/SIRS/E9 -sgpsirsE9.a0, sgpsirsE9.a1
D970927.1SIRS NIPs affected by condensation at E8, E11, E13, & E15sgpsirsE8.a1, sgpsirsE11.a1, sgpsirsE13.a1, sgpsirsE15.a1
D990716.11SGP/SIRS - SIRS E7 April 1999 (part 2 of 3)sgpsirsE7.a0, sgpsirsE7.a1
D990716.13SGP/SIRS - SIRS E8 April 1999 (SERI-QC Results)sgpsirsE8.a0, sgpsirsE8.a1
D990716.14SGP/SIRS - SIRS E9 April 1999 (SERI-QC Results)sgpsirsE9.a0, sgpsirsE9.a1


DQRID : D010423.10
Start DateStart TimeEnd DateEnd Time
02/07/1998021502/13/20011540
Subject:
SGP/SIRS/E9 - Diffuse Pyranometer Thermal Offsets
DataStreams:sgpsirsE9.a0, sgpsirsE9.a1
Description:
Broadband downwelling shortwave diffuse (sky) irradiance measurements available from SIRS
during the period of this Data Quality Report (DQR), require adjustment for thermal
offsets.  These thermal, or ?zero? offsets refer to the generally reduced output signals
from a shaded pyranometer due to the exchange of longwave (infrared) irradiance between
the single black thermopile detector, the protective glass domes surrounding the
detector, and the atmosphere. Originally considered an acceptable nighttime response of
thermopile-type pyranometers, the generally negative bias is now recognized to
significantly effect the accuracy of SIRS diffuse irradiance data during daylight
periods.

Studies of the Eppley Laboratory, Inc. Model PSP (Precision Spectral Pyranometer), used
for the SIRS   measurements of diffuse irradiance, suggest the thermal offset correction
can range from near 0 to as much as 30 Watts per square meter, depending on the
coincident net longwave, or infrared irradiance [1, 2].  Under very clear-sky conditions,
the diffuse irradiance from a shaded PSP can be less than the minimum physical limit
defined by radiative transfer model estimates based only on Rayleigh scattering effects.

A correction method has been developed for adjusting SIRS diffuse irradiance data [3]. 
The resulting Value Added Product (VAP) will be applied to SIRS data for the period of
this DQR.  The VAP will not be applied to SIROS data collected before the instrument
platform was converted to SIRS.

Additionally, the Model PSP radiometer has been replaced by a Model 8-48 which uses a
black and white thermopile detector known to reduce the thermal offset errors to less
than 2 Watts per square meter [3].  The radiometer replacement at this SIRS location was
completed on the ending date of this DQR.

References:
1. Gulbrandsen, A., 1978:  On the use of pyranometers in the study of spectral solar
radiation and atmospheric aerosols.  J. Appl. Meteorol., 17, 899-904.
2. Cess, R. D., X. Jing, T. Qian, and M. Sun, 1999:  Validation strategies applied to the
measurement of total, direct and diffuse shortwave radiation at the surface.  J. Geophys.
Res.
3. Dutton, E.G., J. Michalsky, T. Stoffel, B. Forgan, J. Hickey, D. Nelson, T. Alberta,
and I. Reda, 2001:  Measurement of Broadband Diffuse Solar Irradiance Using Current
Commercial Instrumentation With a Correction for Thermal Offset Errors. J. Atmos. Oceanic
Tech.   Vol 18, No. 3, 297-314.   (March 2001)
Measurements:sgpsirsE9.a1:
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • down_short_diffuse_hemisp_std
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
sgpsirsE9.a0:
  • short_diffuse

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DQRID : D010423.8
Start DateStart TimeEnd DateEnd Time
10/31/1997022702/13/20011925
Subject:
SGP/SIRS/E7 - Diffuse Pyranometer Thermal Offsets
DataStreams:sgpsirsE7.a0, sgpsirsE7.a1
Description:
Broadband downwelling shortwave diffuse (sky) irradiance measurements available from SIRS
during the period of this Data Quality Report (DQR), require adjustment for thermal
offsets.  These thermal, or ?zero? offsets refer to the generally reduced output signals
from a shaded pyranometer due to the exchange of longwave (infrared) irradiance between
the single black thermopile detector, the protective glass domes surrounding the
detector, and the atmosphere. Originally considered an acceptable nighttime response of
thermopile-type pyranometers, the generally negative bias is now recognized to
significantly effect the accuracy of SIRS diffuse irradiance data during daylight
periods.

Studies of the Eppley Laboratory, Inc. Model PSP (Precision Spectral Pyranometer), used
for the SIRS   measurements of diffuse irradiance, suggest the thermal offset correction
can range from near 0 to as much as 30 Watts per square meter, depending on the
coincident net longwave, or infrared irradiance [1, 2].  Under very clear-sky conditions,
the diffuse irradiance from a shaded PSP can be less than the minimum physical limit
defined by radiative transfer model estimates based only on Rayleigh scattering effects.

A correction method has been developed for adjusting SIRS diffuse irradiance data [3]. 
The resulting Value Added Product (VAP) will be applied to SIRS data for the period of
this DQR.  The VAP will not be applied to SIROS data collected before the instrument
platform was converted to SIRS.

Additionally, the Model PSP radiometer has been replaced by a Model 8-48 which uses a
black and white thermopile detector known to reduce the thermal offset errors to less
than 2 Watts per square meter [3].  The radiometer replacement at this SIRS location was
completed on the ending date of this DQR.

References:
1. Gulbrandsen, A., 1978:  On the use of pyranometers in the study of spectral solar
radiation and atmospheric aerosols.  J. Appl. Meteorol., 17, 899-904.
2. Cess, R. D., X. Jing, T. Qian, and M. Sun, 1999:  Validation strategies applied to the
measurement of total, direct and diffuse shortwave radiation at the surface.  J. Geophys.
Res.
3. Dutton, E.G., J. Michalsky, T. Stoffel, B. Forgan, J. Hickey, D. Nelson, T. Alberta,
and I. Reda, 2001:  Measurement of Broadband Diffuse Solar Irradiance Using Current
Commercial Instrumentation With a Correction for Thermal Offset Errors. J. Atmos. Oceanic
Tech.   Vol 18, No. 3, 297-314.   (March 2001)
Measurements:sgpsirsE7.a1:
  • down_short_diffuse_hemisp_std
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
sgpsirsE7.a0:
  • short_diffuse

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DQRID : D010423.9
Start DateStart TimeEnd DateEnd Time
08/21/1997070002/13/20011815
Subject:
SGP/SIRS/E8 - Diffuse Pyranometer Thermal Offsets
DataStreams:sgpsirsE8.a0, sgpsirsE8.a1
Description:
Broadband downwelling shortwave diffuse (sky) irradiance measurements available from SIRS
during the period of this Data Quality Report (DQR), require adjustment for thermal
offsets.  These thermal, or ?zero? offsets refer to the generally reduced output signals
from a shaded pyranometer due to the exchange of longwave (infrared) irradiance between
the single black thermopile detector, the protective glass domes surrounding the
detector, and the atmosphere. Originally considered an acceptable nighttime response of
thermopile-type pyranometers, the generally negative bias is now recognized to
significantly effect the accuracy of SIRS diffuse irradiance data during daylight
periods.

Studies of the Eppley Laboratory, Inc. Model PSP (Precision Spectral Pyranometer), used
for the SIRS   measurements of diffuse irradiance, suggest the thermal offset correction
can range from near 0 to as much as 30 Watts per square meter, depending on the
coincident net longwave, or infrared irradiance [1, 2].  Under very clear-sky conditions,
the diffuse irradiance from a shaded PSP can be less than the minimum physical limit
defined by radiative transfer model estimates based only on Rayleigh scattering effects.

A correction method has been developed for adjusting SIRS diffuse irradiance data [3]. 
The resulting Value Added Product (VAP) will be applied to SIRS data for the period of
this DQR.  The VAP will not be applied to SIROS data collected before the instrument
platform was converted to SIRS.

Additionally, the Model PSP radiometer has been replaced by a Model 8-48 which uses a
black and white thermopile detector known to reduce the thermal offset errors to less
than 2 Watts per square meter [3].  The radiometer replacement at this SIRS location was
completed on the ending date of this DQR.

References:
1. Gulbrandsen, A., 1978:  On the use of pyranometers in the study of spectral solar
radiation and atmospheric aerosols.  J. Appl. Meteorol., 17, 899-904.
2. Cess, R. D., X. Jing, T. Qian, and M. Sun, 1999:  Validation strategies applied to the
measurement of total, direct and diffuse shortwave radiation at the surface.  J. Geophys.
Res.
3. Dutton, E.G., J. Michalsky, T. Stoffel, B. Forgan, J. Hickey, D. Nelson, T. Alberta,
and I. Reda, 2001:  Measurement of Broadband Diffuse Solar Irradiance Using Current
Commercial Instrumentation With a Correction for Thermal Offset Errors. J. Atmos. Oceanic
Tech.   Vol 18, No. 3, 297-314.   (March 2001)
Measurements:sgpsirsE8.a0:
  • short_diffuse
sgpsirsE8.a1:
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
  • down_short_diffuse_hemisp_std

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DQRID : D010430.11
Start DateStart TimeEnd DateEnd Time
09/10/2000000010/10/20002359
Subject:
SGP/SIRS/E7 - Tracking Problems
DataStreams:sgpsirsE7.a1
Description:
Nip off the solar disk, diffuse has become completely unshaded, per Karen Sonntag.
Measurements:sgpsirsE7.a1:
  • down_long_hemisp_std
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • down_short_hemisp_std
  • short_direct_normal_std
  • down_long_hemisp_min
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • down_long_hemisp_max
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • up_long_hemisp_std
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
  • down_short_diffuse_hemisp_std
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • up_short_hemisp_std
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

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DQRID : D020619.2
Start DateStart TimeEnd DateEnd Time
04/01/1999000004/08/19991500
04/09/1999180104/30/19992359
Subject:
SGP/SIRS/E7 - April 1999 Quality Review
DataStreams:sgpsirsE7.a0, sgpsirsE7.a1
Description:
Data quality is good at this site this month with just under 96% of the
daytime data present.  Passing or low-level flags are assigned to 96.1%
of the present daytime data.
Measurements:sgpsirsE7.a1:
  • lat
  • down_short_hemisp_std
  • down_long_hemisp_min
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • vBatt
  • alt
  • up_long_hemisp_std
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • lon
  • up_short_hemisp_std
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • down_long_hemisp_std
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • base_time
  • short_direct_normal_std
  • down_long_hemisp_max
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
  • down_short_diffuse_hemisp_std
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • time_offset
sgpsirsE7.a0:
  • lat
  • up_long_case_resist
  • time_offset
  • short_diffuse
  • down_long_dome_resist
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • up_long_dome_resist
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • base_time
  • alt
  • Observed direct-beam normal solar irradiance(nip)
  • lon
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • down_long_case_resist
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

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DQRID : D020909.3
Start DateStart TimeEnd DateEnd Time
03/18/2000000006/20/20001700
Subject:
SGP/SIRS/E8 - Solar Tracker Failure
DataStreams:sgpsirsE8.a1
Description:
Downwelling Diffuse values too high and Direct Normal 
values too low.  Diffuse pyranometer not shaded due to tracker
failure.  Direct Normal pyrheliometer not properly aligned with the 
solar disc due to tracker failure.  (These radiometers are mounted on 
the same solar tracker.)
Measurements:sgpsirsE8.a1:
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • short_direct_normal_std
  • 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_short_diffuse_hemisp_std
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)

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DQRID : D031124.2
Start DateStart TimeEnd DateEnd Time
01/01/2000000002/01/20000000
Subject:
SGP/SIRS/E8  -
DataStreams:sgpsirsE8.a0, sgpsirsE8.a1
Description:
Data quality this month is OK. The noteable problems follow. Nighttime offsets in the 
Downwelling pyranometer (DS) average about -5 W/m^2 for the month. The Downwelling 
Diffuse pyranometer (DD) averages about -6 W/m^2 for its nighttime offset. There are 
inconsistencies between the Global (DS), Direct (NIP) and Diffuse (DD) components for 
the 4th, 6th and 7th in the afternoon and the 1st, 2nd, 4th, 5th, 7th, 9th, 11th, 15th, 
19th, and 20th in the morning. These inconsistencies range in severity from mild to 
substansial even 
though they all trigger yellow flags only (or stay green). In every case the DD and NIP 
are 

responsivity for all solar zenith angles, or the switchover from daylight to twilight 
testing 
regimes. The daytime negative offset in the DS PSP is also a probable factor in the error. 

It should also be noted that the calibration factors for the PSP's have a tolerance of 
plus or 
minus 5% and the NIP has a tolerance of plus or minus 3%. Upwelling Longwave goes 
below empirical limits on the 4th from 12:25 to 13:25 GMT, the 29th from 13:00 to 
15:20 GMT and on the 31st from 05:15 to 06:30 GMT. The winter Longwave empirical limit
of 250 W/m^2 is currently under further review. (A reading of 250 W/m^2 suggests a 
temperature between 5 and 20 degrees Fahrenheit.) DD goes below nighttime empirical limits 
on the 
local night of the 1st intermittently for a total of about an hour and a half. DS and DD 
go 

daytime empirical limits on the 4th and 7th. Finally, the two longwave components are 

conducted to make a conjecture for possible failure. Upwelling Shortwave (US) goes below 
its 
nighttime empirical limit after sunset on the local nights of the 5th, 12th, and the 15th. 
The 
duration is substantial on the 12th. Something happens on the 27th and 29th where US 
exceeds 
its daytime empircal limit. Snowy conditions is a possible cause.
Measurements:sgpsirsE8.a0:
  • up_long_dome_resist
  • down_long_dome_resist
  • lat
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • base_time
  • up_long_case_resist
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • alt
  • down_long_case_resist
  • short_diffuse
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • lon
  • Observed direct-beam normal solar irradiance(nip)
  • time_offset
sgpsirsE8.a1:
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • alt
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • down_short_hemisp_std
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
  • time_offset
  • lat
  • down_long_hemisp_max
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
  • vBatt
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • down_long_hemisp_min
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • up_long_hemisp_std
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • lon
  • up_short_hemisp_std
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • down_long_hemisp_std
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
  • short_direct_normal_std
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
  • base_time
  • down_short_diffuse_hemisp_std

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DQRID : D031124.3
Start DateStart TimeEnd DateEnd Time
01/01/2000000002/01/20000000
Subject:
SGP/SIRS/E9  -
DataStreams:sgpsirsE9.a0, sgpsirsE9.a1
Description:
Data quality this site- month is excellent. In fact, there are only unnoteworthy and 
insignificant 
problems from the 8th thru the end of the month. Nighttime offsets for the Global (DS) and 
Diffuse 
(DD) pyranometers are -7 W/m^2 a piece. DS and DD dip below their daytime empirical 
limits on the 3rd and 8th. Both days DS is under the limit for under an hour and a half 

inconsistencies between the Global (DS), Direct (NIP) and Diffuse (DD) components for 
the mornings of the 4th and 5th. NIP exceeds its daytime empirical limit on the 7th for 
about 20 minutes. Longwave looks good by automated testing and visual inspection.
Measurements:sgpsirsE9.a1:
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • vBatt
  • down_short_hemisp_std
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
  • down_short_diffuse_hemisp_std
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • alt
  • short_direct_normal_std
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • down_long_hemisp_min
  • down_long_hemisp_std
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • lon
  • time_offset
  • up_short_hemisp_std
  • base_time
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • lat
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
  • up_long_hemisp_std
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • down_long_hemisp_max
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
sgpsirsE9.a0:
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • down_long_case_resist
  • up_long_dome_resist
  • short_diffuse
  • time_offset
  • lon
  • down_long_dome_resist
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • up_long_case_resist
  • lat
  • Observed direct-beam normal solar irradiance(nip)
  • alt
  • base_time

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DQRID : D970927.1
Start DateStart TimeEnd DateEnd Time
09/26/1997123009/26/19971330
09/26/1997123009/26/19971345
09/26/1997123009/26/19971415
Subject:
SIRS NIPs affected by condensation at E8, E11, E13, & E15
DataStreams:sgpsirsE8.a1, sgpsirsE11.a1, sgpsirsE13.a1, sgpsirsE15.a1
Description:
Comparison of data from the unshaded PSP to that derived from the 'direct
+ diffuse' (NIP + shaded PSP) indicated low values of the 'direct+diffuse' combination 
starting at sunrise and lasting for about an hour at E8, E11, E13 and E15.
Futher examination revealed that the NIPs were reading low and were likely
affected by condensation during this brief period. Weather conditions were
foggy over the area early that morning, and fog quickly dissipated after 
sunrise.
Measurements:sgpsirsE15.a1:
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • short_direct_normal_std
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
sgpsirsE11.a1:
  • short_direct_normal_std
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
sgpsirsE8.a1:
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • short_direct_normal_std
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
sgpsirsE13.a1:
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • short_direct_normal_std
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

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DQRID : D990716.11
Start DateStart TimeEnd DateEnd Time
04/08/1999150104/09/19991800
Subject:
SGP/SIRS - SIRS E7 April 1999 (part 2 of 3)
DataStreams:sgpsirsE7.a0, sgpsirsE7.a1
Description:
**Times are Local Standard**
Data are missing during this period.
Measurements:sgpsirsE7.a1:
  • lat
  • down_short_hemisp_std
  • down_long_hemisp_min
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • vBatt
  • alt
  • up_long_hemisp_std
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • lon
  • up_short_hemisp_std
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • down_long_hemisp_std
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • base_time
  • short_direct_normal_std
  • down_long_hemisp_max
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
  • down_short_diffuse_hemisp_std
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • time_offset
sgpsirsE7.a0:
  • lat
  • up_long_case_resist
  • time_offset
  • short_diffuse
  • down_long_dome_resist
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • up_long_dome_resist
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • base_time
  • alt
  • Observed direct-beam normal solar irradiance(nip)
  • lon
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • down_long_case_resist
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

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DQRID : D990716.13
Start DateStart TimeEnd DateEnd Time
04/01/1999000104/30/19992359
Subject:
SGP/SIRS - SIRS E8 April 1999 (SERI-QC Results)
DataStreams:sgpsirsE8.a0, sgpsirsE8.a1
Description:
Data quality for this site is very good this month. All data are present, and 95.5% of the 
present daytime data are assigned passing or low-level flags. Low-level flags seen 
mid-day into early afternoon on clear or partly cloudy days indicate that the DS is too high 
by the three-component test. Alternatively, the DD or NIP may be too low. Strange-but-true 
flags can be seen mid-day on cloudy and overcast. Shortly after sunrise on the 22nd the 
DS and DD were forced below twilight empirical limits by overcast conditions. Shortly 
after noon on the 26th the DS was higher than daytime empirical limits for a short time, 
possibly a case of sunlight reflecting from the edge of a cloud onto the radiometer. No 
problems noted in the UIR, DIR or US signals.
Measurements:sgpsirsE8.a0:
  • up_long_dome_resist
  • down_long_dome_resist
  • lat
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • base_time
  • up_long_case_resist
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • alt
  • down_long_case_resist
  • short_diffuse
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • lon
  • Observed direct-beam normal solar irradiance(nip)
  • time_offset
sgpsirsE8.a1:
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
  • alt
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • down_short_hemisp_std
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
  • time_offset
  • lat
  • down_long_hemisp_max
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
  • vBatt
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • down_long_hemisp_min
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • up_long_hemisp_std
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • lon
  • up_short_hemisp_std
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • down_long_hemisp_std
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
  • short_direct_normal_std
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
  • base_time
  • down_short_diffuse_hemisp_std

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DQRID : D990716.14
Start DateStart TimeEnd DateEnd Time
04/01/1999000104/30/19992359
Subject:
SGP/SIRS - SIRS E9  April 1999  (SERI-QC Results)
DataStreams:sgpsirsE9.a0, sgpsirsE9.a1
Description:
Data quality for this site is very good this month. All data are present, and 88% of the 
present daytime data earns passing or low-level flags. This would be higher but for the 
large number of strange-but-true flags, many of them occurring between the 23rd and 27th. 
Overcast skies forced the DS and DD below the appropriate empirical limits on a number of 
afternoons. Late on the 2nd both the DS and the DD were forced above twilight empirical 
limits. Low-level flags seen shortly after sunrise on clear or partly cloudy days indicate 
that the DS is too low, or that the DD or NIP is too high by the three-component test. 
The NIP fell below daytime empirical limits around noon on the 22nd.
Measurements:sgpsirsE9.a1:
  • Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
  • vBatt
  • down_short_hemisp_std
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Minima(up_long_hemisp_min)
  • down_short_diffuse_hemisp_std
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Minima(short_direct_normal_min)
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • alt
  • short_direct_normal_std
  • Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyranometer, Minima(down_short_hemisp_min)
  • down_long_hemisp_min
  • down_long_hemisp_std
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • lon
  • time_offset
  • up_short_hemisp_std
  • base_time
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • lat
  • Upwelling Longwave Hemispheric Irradiance, Unventilated Pyrgeometer, Maxima(up_long_hemisp_max)
  • Shortwave Direct Normal Irradiance, Pyrheliometer, Maxima(short_direct_normal_max)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Maxima(up_short_hemisp_max)
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • Upwelling Shortwave Hemispheric Irradiance, Unventilated Pyranometer, Minima(up_short_hemisp_min)
  • up_long_hemisp_std
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Minima(down_short_diffuse_hemisp_min)
  • down_long_hemisp_max
  • Downwelling Shortwave Diffuse Hemisp. Irrad., Ventilated Pyranometer, Maxima(down_short_diffuse_hemisp_max)
sgpsirsE9.a0:
  • Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
  • down_long_case_resist
  • up_long_dome_resist
  • short_diffuse
  • time_offset
  • lon
  • down_long_dome_resist
  • Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
  • Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
  • Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
  • up_long_case_resist
  • lat
  • Observed direct-beam normal solar irradiance(nip)
  • alt
  • base_time

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