Abstract
Abstract Radiances in the water vapor (WV) and infrared channels of the Meteorological Satellite (Meteosat)-5 and -7 are being continuously monitored in the form of clear-sky radiances using the operational European Centre for Medium-Range Weather Forecasts (ECMWF) data assimilation system. The clear-sky radiances are provided by the European Organization for the Exploitation of Meteorological Satellites (EUMETSAT), using their scenes analysis to eliminate pixels affected by clouds. The monitoring time series at hourly resolution show that anomalies are present in the clear-sky radiances derived from some images close to satellite local midnight. Particularly strong effects are observed in the WV channel during the eclipse seasons but also for several weeks before and afterward. The effects are caused by solar stray light entering the radiometer and creating different anomaly patterns such as warm bows; small, very intense warm spots; warm and cold horizontal stripes; and calibration anomalies, resulting ...
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