DQRID : D030715.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
07/11/2003163007/16/20031840Incorrect
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Subject:
SGP/SIRS/E5 - Downwelling direct normal (NIP) reporting low
DataStreams:sgpsirsE5.b1, sgpsirs20sE5.a0, sgpsirsE5.00
Description:
There were large differences between the measured downwelling 
              shortwave (DS) and the downwelling shortwave calculated from direct 
              (NIP) and diffuse (DD) readings.  It appears that the direct normal 
              shortwave readings were much too low, particularly on 7/14 and 7/15. 
              It appears that the diffuse instrument was being shaded properly, but 
              the NIP was not tracking the sun. 

              The problem was corrected during the preventative maintenance visit on 
              7/16/03 at 1840GMT.  The technician reported doing the quarterly 
              connection corrosion checks and ventilator fan cleaning, the NIP was 
              described as having "dry-light dust" on the window, no mention of 
              tracker alignment was made.  Although uncertain, a bad connection at 
              some point in the instrument wiring was likely to blame and was 
              eliminated during the corrosion inspection process.
Suggestions: 
Disregard this data.
Measurements:sgpsirsE5.b1:
  • short_direct_normal
  • short_direct_normal_min
  • short_direct_normal_std
  • short_direct_normal_max
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sgpsirs20sE5.a0:
  • inst_direct_normal
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sgpsirsE5.00:
  • Raw data stream - documentation not supported
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