DQRID : D041013.3
Start DateStart TimeEnd DateEnd Time Data Quality Metric
10/09/2004000010/15/20042359Does not affect quality
more
Subject:
NSA/GNDRAD/C1 - Frosting/Condensation
DataStreams:nsagndradC1.00, nsagndrad20sC1.a1, nsagndrad60sC1.b1
Description:
The GNDRAD PIR and IRT comparison was showing the IRT 2-4 W/m^2 greater than the PIR.  
Suspected snow or frost on the instrument(s).  Corrective maintenance performed 10/15/04 at 
21:30 UT.  Optics of both instruments were cleaned.  Upwelling longwave measurement 
agreement restored (+/- 5 W/^2).

Although the relative performance (agreement) of the two instruments improved after 
corrective maintenance (+/- 2 W/m^2), no correction is suggested because the agreement remains 
with the estimated measurement uncertainty of +/- 4 W/m^2 (IRT) and +/-10 W/m^2 (Inverted 
PIR)
Suggestions: 
Measurements:nsagndrad60sC1.b1:
  • up_long_hemisp_min
  • net_std
  • up_long_hemisp
  • sfc_ir_temp
  • sfc_ir_temp_min
  • up_long_hemisp_std
  • up_long_hemisp_max
  • sfc_ir_temp_std
  • sfc_ir_temp_max
more
nsagndradC1.00:
  • Raw data stream - documentation not supported
more
nsagndrad20sC1.a1:
  • pir1_voltage
  • pir1_dome_therm
  • inst_up_long_case_resist
  • inst_up_long_hemisp_tp
  • pir1_case_therm
  • inst_up_long_dome_resist
more

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