After the last Preventative Maintenance at the GONG Teide (TD) site (Canary Islands, Spain) that ended on June 1st, GONG QA monitor showed excessive scatter in airstats plots. The potential issue was traced down to the temperature control of the LCVR (Liquid Crystal Variable Retarder). Preliminary science tests didn't show any problem with the data. As a temporary solution, the LCVR temperature control was turned off on June 24th. The TD airstats came back to normal. A sharp boundary between the data points distribution before and after the LCVR temperature control was disabled is seen on the Figure. We are working to confirm that the problem didn't affect the data.
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