SGP/QCRAD/E10 - Tracker failure

During the night of 11/05-06 2004 the tracker failed at this location. During CM on 12/01, 
power cycling returned the tracker to service. However, tracker was not properly 
tracking in the AM. Tracker failed again sometime near 01/01/2005.	CM reloaded the tracker 
program and realigned the tracker on 01/26/2005 1600GMT correcting the problem.

Documented in instrument DQR: D041206.1

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E10 - Missing surface met data

Surface meteorological data were missing during these time periods. Met data is used in a 
variety of quality control checks described below.

Air temperature data is needed for tests on LW up and LW down pyrgeometer case and dome 
temperatures, and tests on the irradiances from upwelling LW/SW and downwelling LW.

The Rayleigh limit diffuse radiation test is based on surface pressure.

There were no instrument DQRs on this problem at the time this report was submitted.

• Horizontal wind speed(wind_speed)
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
• LWupTd
• LWupTc
• Horizontal wind direction(wind_direction)
• LWdnTc
• LWdnTd
• Pressure, atmospheric, surface, 60-min avg(press)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Humidity, relative(rh)
• Temp_Air
• Precipitation, total(precip)

• Pressure, atmospheric, surface, 60-min avg(press)
• Temp_Air
• LWupTc
• LWupTd
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• Humidity, relative(rh)
• Precipitation, total(precip)
• Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Horizontal wind speed(wind_speed)
• LWdnTc
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Horizontal wind direction(wind_direction)
• LWdnTd

SGP/QCRAD/E27 - Tracker failed

Suntracker failed at this facility. The suntracker was reset on	9/17, but this only 
temporarily fixed the problem and the tracker began failing again 9/18.  Tracker was reset and 
realigned on 10/15/03 17:30GMT.

Documented in instrument DQR D030922.4

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

SGP/QCRAD/E27 - Tracker failure

Possible main power problem made may have caused the tracker to fail.  Attempts to restart 
the old tracker, subsequent replacement and lack of spares contributed to incorrect data 
from the NIP (short_direct_normal datastream) and 8-48 (down_short_diffuse_hemisp 
datastream) until the time of site decommissioning.  

This facility was decommissioned and maintenance efforts ceased 10/1/2009. The instrument 
was removed from service 12/04/2009.

Documented in instrument DQR D090609.1

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Irradiance, longwave, downwelling, hemispheric(down_long_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

SGP/QCRAD/E10 - Reprocess: Wrong calibration factor applied to NIP

From about 950721 to about 970204 (19:12 GMT) the wrong calibration
factor was applied to the NIP at site E10.  The calibration factor
that was used was 1.00E-06 Volts/(W m^2).  The correct calibration
factor is 8.338E-06 Volts/(W m^2).  Thus the calibrated NIP values
found in the netCDF files are too large by a factor of 8.338.

Documented in instrument DQR D970213.1

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

SGP/QCRAD/E25 - Missing Best estimate and global values

Many best estimate and GSW values are missing during this time period. Some of this data 
could be filled with MFRSR measurements.

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

SGP/QCRAD/E25 - NIP data questionable

Direct normal irradiance values are strange during this period. No instrument DQR 
currently exists documenting the problem and its cause is not known.

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

SGP/QCRAD/E27 - Reprocess: Incorrect calibration coefficients

Logger reverted to previous years configuration, possibly due to power outage and 
non-current logger program in storage module.  Note, the tracker had failed during this period as 
well.

The configurations are as follows:
Correct S/N and coefficients for this station during this time
Diffuse PSP:   33268F3
PSP-US:        30811F3
NIP:	       29578E6
PSP-DS:        30903F3
Diffuse PSP: 118.49 W/(m^2*mV)
PSP-US:      116.66 W/(m^2*mV)
NIP:	     123.30 W/(m^2*mV)
PSP-DS:      128.92 W/(m^2*mV)

Incorrect S/N and coefficients applied during this time range.
Diffuse PSP:   33366F3
PSP-US:        30961F3
NIP:	       29009E6
PSP-DS:        20386F3
Diffuse PSP: 111.68 W/(m^2*mV)
PSP-US:      111.85 W/(m^2*mV)
NIP:	     111.03 W/(m^2*mV)
PSP-DS:      104.15 W/(m^2*mV)

Data must be reprocessed for all shortwave instruments; longwave instruments are 
unaffected. The following corrections must be applied:

down_short_diffuse_hemisp(new) = down_short_diffuse_hemisp(old) * 118.49/111.68
up_short_hemisp(new) = up_short_hemisp(old) * 116.66/111.85
short_direct_normal(new) = short_direct_normal(old) * 123.30 / 111.03
down_short_hemisp(new) = down_short_hemisp(old) * 128.92 / 104.15

Reference instrument DQR D090521.1

• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Radiation, shortwave, downwelling total hemispheric irradiance, 1-min avg(down_short_hemisp)

• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)

• Radiation, shortwave, downwelling diffuse hemispheric irradiance, 1-min avg(down_short_diffuse_hemisp)
• Best Estimate Global Downwelling Shortwave Hemispheric Irradiance(BestEstimate_down_short_hemisp)
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• Radiation, shortwave, direct normal irradiance, 1-min avg(short_direct_normal)

SGP/QCRAD/E10 - Noisy upwelling longwave

Upwelling Infrared irradiance signals noisy resulting from problems with pyrgeometer 
signal cable connections.

Documented in instrument DQRs D030110.37, D030110.36, D031027.1

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

SGP/QCRAD/E10 - Noisy upwelling shortwave flux

Beginning 6/22, upwelling shortwave values frequently dropped well below 0 W/m^2 
(occasionally dropping below -50 W/m^2) during the nighttime hours.  Daytime values were 
excessively high and noisy. Instrument wiring was suspected and was corrected 07/02/2003.

Documented in instrument DQR D030701.1

• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)

• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)

• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)

• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)

SGP/QCRAD/E25  - Noisy LWup Tc/Td

Case and dome temperatures for upwelling Longwave fluxes are noisy during this period 
corresponding to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• LWupTd
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• LWupTc

• LWupTc
• LWupTd
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• LWupTd
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• LWupTc

• LWupTc
• LWupTd
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

SGP/QCRAD/E10  - LWup Tc/Td bad

Case and dome temperatures for upwelling longwave fluxes are bad during this period so 
some tests cannot be done on upwelling fluxes.

No instrument DQRs exist documenting this problem.

• LWupTd
• LWupTc
• 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)

• LWupTc
• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• LWupTd
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• LWupTc
• LWupTd
• 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)

• Radiation, shortwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_short_hemisp)
• LWupTc
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• LWupTd

SGP/QCRAD/E10  - Upwelling LW Tc/Td/flux questionable

Case and dome temperatures for upwelling longwave flux are sporadically questionable 
during this period corresponding to additional noise in the longwave fluxes.

No instrument DQRs exist documenting this problem.

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• LWupTd
• LWupTc

• LWupTc
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• LWupTd

• LWupTc
• LWupTd
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• LWupTc
• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)
• LWupTd

SGP/QCRAD/E25 - Upwelling longwave out of range

Upwelling longwave irradiance exceeds physical limits. Data are consistently negative and 
range from -1000 to -2000 W/m2 due to equipment problem(s).

Documented in instrument DQR D021028.1

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)

• Radiation, longwave, at 10-m height, upwelling hemispheric irrad., 1-min avg(up_long_hemisp)