DQRID : D040227.4
Start DateStart TimeEnd DateEnd Time
02/20/2004190002/29/20041700
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Subject:
SGP/SIRS/E15 - PSP dome contamination
DataStreams:sgpsirsE15.b1, sgpsirs20sE15.a0
Description:
PSP dome was dirty.  Afternoon values of downwelling shortwave radiation were less than 
derived values by about 50 W/m^2.  

PSP values compare well to derived PSP values after precip event on 02/29/04 1300-1600 
GMT. Maintenance on 03/02 1713 GMT revealed no unusual contamination.  Precip on 02/29 
likely effectively cleaned the PSP dome.
Suggestions: 
Disregard afternoon PSP data from 1900-2300 GMT for clear skies
Measurements:sgpsirs20sE15.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Pyranometer Thermopile Voltage(inst_global)
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sgpsirsE15.b1:
  • Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
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