DQR ID | Subject | Data Streams Affected |
---|---|---|
D080829.3 | SGP/RL/C1 - Degraded sensitivity in WFOV channels | sgprlC1.a0, sgprlprofmerge1turnC1.c0 |
D080909.1 | SGP/RL/C1 - No liquid water data in RLPROFmerge | sgprlprofmerge1turnC1.c0 |
D090122.2 | SGP/RL/C1 - Invalid mode 0 data | sgprlC1.a0, sgprlprofmerge1turnC1.c0 |
Start Date | Start Time | End Date | End Time |
---|---|---|---|
03/07/2008 | 0000 | 03/10/2008 | 1500 |
03/25/2008 | 0500 | 04/04/2008 | 1600 |
04/09/2008 | 1800 | 04/10/2008 | 1500 |
Subject: | SGP/RL/C1 - Degraded sensitivity in WFOV channels |
DataStreams: | sgprlC1.a0, sgprlprofmerge1turnC1.c0 |
Description: | The sensitivity of all the wide field-of-view (WFOV) channels was abnormally low due a malfunction of the filter wheel. The filter wheel for the WFOV channels did not rotate into position properly and thus partially obscured the return light. |
Measurements: | sgprlprofmerge1turnC1.c0:
sgprlC1.a0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
09/06/2006 | 0000 | 03/04/2008 | 2359 |
Subject: | SGP/RL/C1 - No liquid water data in RLPROFmerge |
DataStreams: | sgprlprofmerge1turnC1.c0 |
Description: | From 20060906 to 20080304 the liquid water channel (LWC) was disabled due to the removal of its photomultiplier tube (PMT). During this period the signals recorded in the sgprlC1.a0 files for the LWC contain invalid data, and so the decision was made not have the rlprof_merge vap process the LWC data. As a result, the sgprlprofmerge1turnC1.c0.*.cdf files contain NO LWC fields (variables or attributes) during this period. Do not attempt to read any fields (variables or attributes) associated with the liquid water channel in the sgprlprofmerge1turnC1.c0.*.cdf files between the dates of 20060906 through 20080304. |
Measurements: | sgprlprofmerge1turnC1.c0:
|
Start Date | Start Time | End Date | End Time |
---|---|---|---|
11/12/2008 | 0000 | 01/13/2009 | 0000 |
Subject: | SGP/RL/C1 - Invalid mode 0 data |
DataStreams: | sgprlC1.a0, sgprlprofmerge1turnC1.c0 |
Description: | On 20081112 the filter wheel for the wide field-of-view (WFOV) channel was incorrectly rotated. The net effect was that we were recording neutral density filter data when we should have been collecting data with the channels completely blocked (mode 0 data). As a result, the WFOV mode 0 data contains contributions from the pulse return and the solar background that should not be present. The mode 0 data is used in the rlprof_merge VAP to remove the electronic background level from the analog signal. After the problem was identified the filter wheel was set back to its proper rotation on 20090112. A work-around has been implemented in the rlprof_merge VAP to handle the lack of valid mode 0 during the affected period. The work-around involves computing the electronic background from pre-pulse data during nighttime periods only. With this technique we are not able to estimate the range-dependence of the electronic backgound, as we did before. However, this range dependence is typically quite weak, and so the impact on the rlprof_merge output is expected to be minimal. |
Measurements: | sgprlprofmerge1turnC1.c0:
sgprlC1.a0:
|