Start Date | Start Time | End Date | End Time | Data Quality Metric |
---|---|---|---|---|
04/28/2002 | 0200 | 08/29/2002 | 0100 | Missing |
Subject: | NSA/MPL/C1 - laser head failure |
DataStreams: | nsamplC1.a1, nsamplC1.00, nsamplsmask1clothC1.c1, nsamplcmask1clothC1.c1 |
Description: | On 2002-04-28 the laser energy was observed to decrease throughout the day. Although low clouds continued to be detected, by the end of the day the output laser energy was about 10% of nomimal. This decrease continued throughout 2002-04-29 to the extent that clouds were no longer detected. The source of failure was eventually determined to be the laser head, requiring the MPL to be shipped for repair. The MPL was reinstalled on 2002-08-28 at about 01:00 UTC. MPL NSA data from 2002-04-29 through 2002-08-27 (inclusive) should not be used. |
Suggestions: | Use other measures of cloud base such as millimeter cloud radar or Vaisala Ceilometer, both of which were operational throughout this period. |
Measurements: | nsamplcmask1clothC1.c1: more
nsamplsmask1clothC1.c1: more nsamplC1.a1: more nsamplC1.00: more |