Decontamination involved melting the ice accumulated on the cold optics and detectors, which adversely affects the instrument’s performance.
SEVIRI decontamination heaters were switched on to decontaminate the instrument on 5 September. This process, including a post-heating cool-down phase (after heaters are switched off), continued until 8 September.
On 9 September, SEVIRI imaging and calibrations restarted, and, on 10 September, the instrument’s imaging performance was optimised following decontamination.
On 11 September, a test was conducted in which SEVIRI performed 2.5-minute rapid scans for 24 hours. SEVIRI imaging will now (from 13 September) be conducted as if MSG-3 were in routine operations so imaging performance and meteorological product extraction can be optimised before the decision can be made to deploy MSG-3 in operations.