Calibration of the Meteosat-5 sensor visible channel

Following a previous work to calibrate the visible (VIS) channel of the Met eosat radiometers between 1983 and 1994 (Moulin et al. 1996), this letter p resents a calibration of the Meteosat-5 channel during its whole operation period between February 1994 and February 1997 using the same method. Resul ts generally confirm the previous estimate based on the limited 1994 data s et. The drift of the VIS channel calibration, although larger than previous ly estimated, remained relatively low (1.1% per year) however.