DQRID : D060331.2
Start DateStart TimeEnd DateEnd Time
10/26/2005163004/04/20062005
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Subject:
SGP/SIRS/E1 - Intermittantly missing downwelling diffuse
DataStreams:sgpsirs20sE1.a0, sgpsirsE1.00, sgpsirsE1.b1
Description:
Starting on or about 10/26/2005 the downwelling diffuse hemispheric irradiance (Eppley 
8-48) instrument had intermittant missing values. Technicians found a loose wire on the 
instrument connector and repaired it on 4/4/2006. 

Use global shortwave hemispheric (PSP) component - normal incident component (CosZA*NIP) 
to calulate diffuse component.  Comparison of absolute difference between actual and 
computed diffuse component values and diffuse standard deviations > 1-2 W/m2 can help filter 
the noisy diffuse data.  There is no standard method.
Suggestions: 
Measurements:sgpsirsE1.b1:
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Ventilated Pyranometer(down_short_diffuse_hemisp)
  • Downwelling shortwave diffuse hemispheric irradiance, pyranometer, maxima(down_short_diffuse_hemisp_max)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyranometer, Standard
    Deviation(down_short_diffuse_hemisp_std)
  • Downwelling Shortwave Diffuse Hemispheric Irradiance, Pyrgeometer, Minima(down_short_diffuse_hemisp_min)
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sgpsirs20sE1.a0:
  • Instantaneous uncorrected downwelling shortwave diffuse, shaded pyranometer
    thermopile voltage(inst_diffuse)
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sgpsirsE1.00:
  • (Raw data stream - documentation not supported)
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