DQRID : D030916.6
Start DateStart TimeEnd DateEnd Time
03/05/2001000004/17/20032359
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Subject:
SGP/BRS/C1 - low downwelling shortwave readings
DataStreams:sgpbrsC1.a2, sgpbrsC1.00, sgpbrs60sC1.a1, sgpbrs20sC1.a0
Description:
Downwelling shortwave (DS) values frequently drop below -10 W/m^2 at night, and are 
consistently 20-40 W/m^2 less than the calculated downwelling shortwave during the day in 
clear-sky conditions. Corrective maintenance on 12/1/2004 corrected this offset.  It is not 
clear which CM action corrected the problem since the DS instrument cable was grounded to a 
new location and the DS ventilator fan was found in poor condition and was replaced.  
Either of these issues could have led to the problem observed in this instrument.
Suggestions: 
disregard data
Measurements:sgpbrs60sC1.a1:
  • Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
more
sgpbrs20sC1.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Pyranometer Thermopile Voltage(inst_global)
more
sgpbrsC1.a2:
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
more
sgpbrsC1.00:
  • (Raw data stream - documentation not supported)
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