Data Quality Reports for Session: 112532 User: nbeavis Completed: 06/17/2008


TABLE OF CONTENTS

DQR IDSubjectData Streams Affected
D040421.3NSA/SKYRAD/C1 - itermittant IRT biasnsaskyrad60sC1.b1


DQRID : D040421.3
Start DateStart TimeEnd DateEnd Time
03/28/2003020006/21/20060215
Subject:
NSA/SKYRAD/C1 - itermittant IRT bias
DataStreams:nsaskyrad60sC1.b1
Description:
A problem with the SKYRAD IRT that itermittantly produced a gradual increase in the sky 
temperature measurement then a sudden correction, as compared to AERI, appears to have been 
caused by a combination of a failing IR detector, a poor signal cable, a contaminated 
(with condensation or frost) mirror or lens, and low ambient temperatures. The positive 
bias was apparently not consistant in either frequency or duration but on days when the 
unusual behavior is observed, it usually occurred from about 00:00 to 06:00 local time. 

The instrument was repaired and recalibrated and the signal cable replaced.
Measurements:nsaskyrad60sC1.b1:
  • Sky Infra Red Temperature Minima(sky_ir_temp_min)
  • Sky Infra Red Temperature Maxima(sky_ir_temp_max)
  • Standard Deviation of Sky Infra Red Temperature(sky_ir_temp_std)
  • Sky Infra-Red Temperature(sky_ir_temp)


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