DQRID : D090514.2
Start DateStart TimeEnd DateEnd Time Data Quality Metric
05/06/2009155005/18/20091830Incorrect
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Subject:
SGP/SIRS/E12 - NIP failure
DataStreams:sgpsirs20sE12.a0, sgpsirsE12.b1
Description:
The short_direct_normal values are mostly missing (-9999) starting when the datastream 
came back from an extended period of no data files.  Ops determined the NIP 
(short_direct_normal datastream) instrument had failed and it was replaced.

Values of short_direct_normal can be reconstructed using the following relationship 
applied for each time period:
short_direct_normal = (down_short_hemisp - down_short_diffuse)/cos (zenith angle)
Suggestions: 
Measurements:sgpsirs20sE12.a0:
  • inst_direct_normal
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sgpsirsE12.b1:
  • short_direct_normal
  • short_direct_normal_min
  • short_direct_normal_max
  • short_direct_normal_std
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