DQRID : D080513.1
Start DateStart TimeEnd DateEnd Time
05/10/2008000005/14/20081827
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Subject:
SGP/SIRS/E1 - Dirt on dome
DataStreams:sgpsirsE1.b1, sgpsirs20sE1.a0
Description:
The down_short_hemisp was showing signs of a dirty dome at local solar noon. PM removed 
bird droppings on 5/14.

The down_short_hemisp (PSP) data is not recoverable. Suggest using component sum method to 
reconstruct down_short_hemisp for each minute data:

down_short_hemisp = down_short_diffuse_hemisp + short_direct*cos(solar zenith angle).

See SIRS instrument handbook for additional info.
Suggestions: 
Measurements:sgpsirsE1.b1:
  • Down-welling unshaded pyranometer voltage(down_short_hemisp)
  • Downwelling Shortwave Hemispheric Irradiance, Ventilated Pyrgeometer, Standard
    Deviation(down_short_hemisp_std)
  • Downwelling shortwave hemispheric irradiance, pyranometer, maxima(down_short_hemisp_max)
  • Downwelling Shortwave Hemispheric Irradiance, Pyranometer, Minima(down_short_hemisp_min)
more
sgpsirs20sE1.a0:
  • Instantaneous Downwelling Hemispheric Shortwave, Pyranometer Thermopile Voltage(inst_global)
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