DQR ID | Subject | Data Streams Affected |
---|---|---|
D040415.1 | NSA/SKYRAD/C1 - direct normal pyhrheliometer (NIP)shaded by WWRp | nsaskyradC1.00, nsaskyrad60sC1.b1 |
D040421.3 | NSA/SKYRAD/C1 - itermittant IRT bias | nsaskyrad60sC1.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/09/2004 | 1500 | 04/16/2004 | 1600 |
Subject: | NSA/SKYRAD/C1 - direct normal pyhrheliometer (NIP)shaded by WWRp |
DataStreams: | nsaskyradC1.00, nsaskyrad60sC1.b1 |
Description: | Direct normal radiation values drop nearly to zero from about 1515 GMT - 1525 GMT from 4/05 to 4/16 2004. Field observation reveals the WWRp is shading the NIP instrument during this time. This shading event was expected to occur several months after the soltice as well but archive data showed no shading on or around 8/30/2004. The direct normal instrument was apparently only shaded during the time period noted. |
Measurements: | nsaskyradC1.00:
nsaskyrad60sC1.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/28/2003 | 0200 | 06/21/2006 | 0215 |
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:
|