Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
09/30/2002 | 1800 | 07/31/2006 | 2359 | Does not affect quality |
Subject: | SGP/MFRSR/E11 - Apparent calibration change |
DataStreams: | sgpmfrsrlangplotE11.c1, sgpmfrsrE11.a0, sgpmfrsrE11.b1, sgpmfrsrlangleyE11.c1 |
Description: | This DQR was updated on 20130312. On 20020930 there is step change in the irradiance channels after a short period of missing data. It is as if the instrument was changed, or a new calibration performed. There is no evidence either occurred. After examining the data, this "change" seems to have reverted at midnight UTC on 20060731/20060801. Again, there is no evidence to indicate why this might have happened. During the ~4 years this instrument operated like this it appears to have done so without issue. The c1 data level calibration procedures should resolve issues like this, so this DQR is being set to transparent. This is a change from the original open-ended DQR that was issued. The original discussion is preserved below. ----------------------------- On 9/30/2002 it appears a head or logger was swapped. However, there is no record of this. Also, if a head or logger was swapped, new calibration files would be required, and there are none that correspond to this date. On this date at about 1800 UTC the channels appear to have different calibrations. That is, each channel is not continuous throughout the day. Channel 615 is particularly affected. Other than relative changes in each channel, the instrument appears to be operating fine. The relative changes are not show-stopper for using the data. When the c1 level data are available for this site, the data should be perfectly usable. Since the c1 data should be fine, and the instrument seems to operating OK, this DQR is being tagged yellow. |
Suggestions: | If calibrated data are required, wait for the c1 level data to become available. As those data are Langley calibrated, they won't be affected by the relative changes seen in the b1 level data. |
Measurements: | sgpmfrsrlangplotE11.c1: more
sgpmfrsrlangleyE11.c1: more sgpmfrsrE11.a0: more sgpmfrsrE11.b1: more |