DQR ID | Subject | Data Streams Affected |
---|---|---|
D000608.1 | TWP/SKYRAD/C2 - Probable window contamination | twpskyrad60sC2.a1, twpskyrad60sC2.b1 |
D010509.4 | TWP/SKYRAD/C2 - PIR offline for B/W comparison | twpskyrad20sC2.a1, twpskyrad60sC2.a1, twpskyrad60sC2.b1 |
D011019.8 | TWP/SKYRAD/C2 - Solar tracker failure | twpskyrad60sC2.a1, twpskyrad60sC2.b1 |
D011207.1 | TWP/SKYRAD/C2 - Solar tracker failure | twpskyrad20sC2.a1, twpskyrad60sC2.a1, twpskyrad60sC2.b1 |
D020814.2 | TWP/SKYRAD/C2 - Reprocess: PIR identified as unshaded is really shaded | twpskyrad60sC2.b1 |
D030821.5 | TWP/SKYRAD/C2 - IRT incorrect min/delta values | twpskyrad60sC2.b1 |
D041026.2 | TWP/SKYRAD/C2 - IRT bias | twpskyrad60sC2.b1 |
D050219.2 | TWP/SKYRAD/C2 - IRT bias | twpskyrad60sC2.b1 |
D060804.1 | TWP/SKYRAD/C2 - IRT signal loss | twpskyrad60sC2.b1 |
D061016.1 | TWP/SKYRAD/C2 - IRT signal | twpskyrad60sC2.b1 |
D070206.1 | TWP/SKYRAD/C2 - Short direct normal | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D070404.2 | TWP/SKYRAD/C2 - IRT measurement error | twpskyrad60sC2.b1 |
D071204.2 | TWP/SKYRAD/C2 - Reprocessed: Incorrect calibrations | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D080313.2 | TWP/SKYRAD/C2 - Direct Normal reading too low | twpskyrad20sC2.a0, twpskyrad60sC2.b1, twpskyradC2.00 |
D081222.3 | TWP/SKYRAD/C2 - Tracker failure | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D090328.1 | TWP/SKYRAD/C2 - Tracker inoperative | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
D090605.2 | TWP/SKYRAD/C2 - Instrument grounding problem | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/16/1999 | 0400 | 01/19/1999 | 0200 |
02/06/1999 | 2200 | 02/08/1999 | 0300 |
02/18/1999 | 2200 | 02/20/1999 | 2300 |
12/01/1999 | 0000 | 12/23/1999 | 2359 |
Subject: | TWP/SKYRAD/C2 - Probable window contamination |
DataStreams: | twpskyrad60sC2.a1, twpskyrad60sC2.b1 |
Description: | On several occasions in early 1999, large (10 percent) differences between the global PSPs and the NIP were observed. In each case, the NIP reported low relative to the direct flux reported by the PSPs. These occurrences persisted for several days each time and were likely due to salt on one or more of the radiometers. There was a large discrepancy in the comparison of the PSPs and NIP during December (5-10 percent). This discrepancy got worse through the month and then suddenly improved after a rain event on December 23. There was likely salt deposited on the radiometer windows that was washed off in the rain. The observer daily rounds were being modified to include more regular cleaning of radiometers to address this issue. |
Measurements: | twpskyrad60sC2.b1:
twpskyrad60sC2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/08/2001 | 2000 | 05/10/2001 | 0400 |
Subject: | TWP/SKYRAD/C2 - PIR offline for B/W comparison |
DataStreams: | twpskyrad20sC2.a1, twpskyrad60sC2.a1, twpskyrad60sC2.b1 |
Description: | The shaded PIR was disconnected so a side by side comparison could be made with the shaded PSP and new shaded B/W PSP. |
Measurements: | twpskyrad20sC2.a1:
twpskyrad60sC2.b1:
twpskyrad60sC2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
08/06/1999 | 1200 | 10/15/1999 | 1200 |
Subject: | TWP/SKYRAD/C2 - Solar tracker failure |
DataStreams: | twpskyrad60sC2.a1, twpskyrad60sC2.b1 |
Description: | During Reset7 (8/6) the skytracker firmware was upgraded for Y2K. While still at the site, the mentor noted that the tracker was sticking and replaced it on 8/8/99. The replacement tracker also failed. Repeated attempts through 8/13 were not successful. After 8/13, the tracker was not operational. It was found that the problem was the result of bugs in the Y2K compliant version (2.44) of the firmware. On 10/14, Jeff Zirzow installed a new tracker with the Y2K non-compliant version (2.43) of the firmware. It was correctly assumed that the Y2K issues would only be apparent at the 19991231-20000101 time boundary. Exact times of changes are not known; noon GMT (midnight Local) was used to adequately window the time period of the changes. |
Measurements: | twpskyrad60sC2.b1:
twpskyrad60sC2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
06/25/2001 | 0000 | 08/17/2001 | 2359 |
08/25/2001 | 0000 | 09/04/2001 | 2359 |
09/21/2001 | 0000 | 09/26/2001 | 2359 |
Subject: | TWP/SKYRAD/C2 - Solar tracker failure |
DataStreams: | twpskyrad20sC2.a1, twpskyrad60sC2.a1, twpskyrad60sC2.b1 |
Description: | The solar tracker malfunctioned and did not track the sun reliably during the specified periods. PIR, PSP, and NIP data are suspect. The solar tracker may have operated satisfactorily during some periods within these time frames. Approximate verification on quality could be made by comparing the NIP data with the MFRSR data. |
Measurements: | twpskyrad20sC2.a1:
twpskyrad60sC2.b1:
twpskyrad60sC2.a1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/17/2001 | 0300 | 04/30/2002 | 2359 |
Subject: | TWP/SKYRAD/C2 - Reprocess: PIR identified as unshaded is really shaded |
DataStreams: | twpskyrad60sC2.b1 |
Description: | On 17Sep01 the Global PIR was moved from the unshaded position on the Skyrad stand to the new 'shaded' spot on the new K&Z tracker. It is still using the same Logger channel as it did as an unshaded PIR even though it is now shaded. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
04/01/2001 | 0005 | 03/03/2003 | 2102 |
Subject: | TWP/SKYRAD/C2 - IRT incorrect min/delta values |
DataStreams: | twpskyrad60sC2.b1 |
Description: | For field sky_ir_temp, the value of valid_min was incorrectly assigned to -49.7 C and no value of valid_delta was assigned. The actual values should be -60 and 50 C, respectively. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/13/2004 | 0600 | 10/18/2004 | 2300 |
Subject: | TWP/SKYRAD/C2 - IRT bias |
DataStreams: | twpskyrad60sC2.b1 |
Description: | The IRT appears to be measuring higher sky temperatures than the AERI. There is no indication as to its cause or whether the IRT or the AERI is at fault. PRB note: because the AERI is calibrated between each sample, the AERI data has a high degree of confidence and the bias is likely on the part of the IRT. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
02/07/2005 | 0454 | 04/17/2005 | 2023 |
Subject: | TWP/SKYRAD/C2 - IRT bias |
DataStreams: | twpskyrad60sC2.b1 |
Description: | The IRT was measuring higher sky temperatures than AERI. The problem was corrected by changing the mirror. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
07/19/2006 | 2239 | 07/24/2006 | 0727 |
Subject: | TWP/SKYRAD/C2 - IRT signal loss |
DataStreams: | twpskyrad60sC2.b1 |
Description: | There was a significant drop in logger voltage that corresponds with a loss of the IR temperature. This was possibly due to a loose connection. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
10/13/2006 | 0135 | 12/04/2006 | 2120 |
Subject: | TWP/SKYRAD/C2 - IRT signal |
DataStreams: | twpskyrad60sC2.b1 |
Description: | The IRT exhibited a bias of the analog voltage output that caused problems with the signals from the other SKYRAD radiometers. The bias was due to corrosion between the power and signal connections in the IRT cable. The IRT was disconnected on 10/18/2006 at 01:20 and replaced on 11/6/2006 at 23:00 but it too appeared to have grounding problems due to internal corrosion and was disconnected on 11/11/2006 at 11:42 and then intermittently reconnected for testing. A second spare was installed on 12/4/2006 which did not cause problems with the signals from the other instruments. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
01/31/2007 | 0223 | 02/10/2007 | 0055 |
Subject: | TWP/SKYRAD/C2 - Short direct normal |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
Description: | The short_direct_normal (NIP) data are missing or incorrect due to instrument cable failure. The cable was replaced. The short_direct_normal can be calculated using the following relationship for shortwave radiometers: global hemispheric = diffuse hemispheric + direct normal *cos (zenith angle) |
Measurements: | twpskyrad60sC2.b1:
twpskyrad20sC2.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/04/2006 | 2120 | 02/22/2007 | 0125 |
Subject: | TWP/SKYRAD/C2 - IRT measurement error |
DataStreams: | twpskyrad60sC2.b1 |
Description: | The IRT was not properly calibrated and was not able to measure sky temperatures below 273.2 K. (This instrument was the same one damaged by lightning in November 2005 in Darwin. It was returned for repair and received a new lens but was calibrated only down to 0 deg C, so the problem was neither detected nor repaired.) The IRT was replaced on 2/22/2007. |
Measurements: | twpskyrad60sC2.b1:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/25/2007 | 2220 | 11/30/2007 | 1726 |
Subject: | TWP/SKYRAD/C2 - Reprocessed: Incorrect calibrations |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
Description: | The SKYRAD PSPs were changed out 11/25 but the datalogger program was not updated until 11/30. Reprocessed to correct calibration per: down_short_diffuse(corrected) = down_short_diffuse(orig) * (118.18/112.42) short_direct_normal(corrected)= short_direct_normal(orig) * (122.20/118.11) down_short_hemips(corrected) = down_short_hemisp(orig) * (133.16/137.57) Reprocessing completed March 2008. |
Measurements: | twpskyrad60sC2.b1:
twpskyrad20sC2.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/02/2008 | 2230 | 03/10/2008 | 2130 |
Subject: | TWP/SKYRAD/C2 - Direct Normal reading too low |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1, twpskyradC2.00 |
Description: | The NIP (direct_normal shortwave irradiance) measurement was reading too low during this time period. No TWP Ops documentation could be found to determine the cause but data review indicate that the NIP appeared to be reading low by about 25W/m2 during this period. The NIP data had well defined steps in irradiance when compared to three component checks indicating the problem period. |
Measurements: | twpskyrad60sC2.b1:
twpskyrad20sC2.a0:
twpskyradC2.00:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
12/17/2008 | 1942 | 12/21/2008 | 2215 |
Subject: | TWP/SKYRAD/C2 - Tracker failure |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
Description: | Tracker failed to wake up on 12/17. Ops reset tracker on 12/21. The affected instruments are the 8-48 (down_short_diffuse) and NIP (direct_normal) shortwave instruments. |
Measurements: | twpskyrad60sC2.b1:
twpskyrad20sC2.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/25/2009 | 2000 | 05/18/2009 | 0442 |
Subject: | TWP/SKYRAD/C2 - Tracker inoperative |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
Description: | The tracker failed in park position. Tracker was replaced 5/14 but did not resume fully normal operation until 5/18. The down_short_diffuse and short_direct_normal data are directly affected by this failure. These data are not recoverable. |
Measurements: | twpskyrad60sC2.b1:
twpskyrad20sC2.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
05/21/2009 | 1855 | 05/25/2009 | 2100 |
Subject: | TWP/SKYRAD/C2 - Instrument grounding problem |
DataStreams: | twpskyrad20sC2.a0, twpskyrad60sC2.b1 |
Description: | During this time period the IRT analog output line appears to have adversely affected the skyrad datalogger grounding. This resulted in intermittent anomalous readings across all skyrad datalogger channels including logger voltage. |
Measurements: | twpskyrad60sC2.b1:
twpskyrad20sC2.a0:
|