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THE NERC MST RADAR FACILITY AT ABERYSTWYTH
CORRECTION TO LASER CEILOMETER CLOUD BASE ALTITUDE FILES (8th - 27th JANUARY
The Vaisala LD40 laser ceilometer developed an internal fault at 20:48 UT on 3rd January 2010, which prevented it from making observations. The problem cleared by itself at 21:42 UT on 4th January but re-occurred at 00:29 UT on 8th January, lasting until 13:23 UT of the same day. The cause of the problem is not known.
In connection with this problem, the LD40's internal clock, which is used to generate the time stamps for the data messages, suddenly jumped to from 13:23 UT to 03:05 UT on 8th January (the date stamp subsequently became corrupted). This resulted in the time stamps being in error in all cloud base altitude files, and their corresponding quick look plots, 8th - 27th January 2010. This problem was corrected in software on 29th January 2010 and all BADC files (and quick-look plots) for the affected period have now been regenerated.
If you have made use of any of the cloud base altitude files from this period, please contact the NERC MST Radar Facility Project Scientist if you have any further questions.
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Last updated 29th January 2010