Metop-A MHS channel 2

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    Nigel AtkinsonNigel Atkinson
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    MHS channel 2 on Metop-A is degrading (gain dropping, noise rising). In the last few days the warm counts have gone below the existing lower limit in AAPP. To restore calibration you can update the mhs_clparams.dat file on your systems. You can find the new one at ftp://ftp.eumetsat.int/pub/NWPSAF/aapp_data_files/atovs_cal_files/.

    In AAPP, this file exists at AAPP/src/calibration/libmhscl and in the installation directory at AAPP/data/calibration/coef/mhs.

    The channel 2 limit has been lowered from 20000 to 15000 counts. EUMETSAT are doing the same in their ground system. However, in view of the rather rapid degradation we are not sure for how long this will last.

    Nigel

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