Megha-Tropiques on-board issue from 8 November 2018 to 21 March 2019
Date: 2019/06/04
Following an interruption of data production at the end of 2018,
investigations on this issue ran from mid December 2018 to end February
2019. The issue is located in the satellite data handling sub system.
Actually, the memory is sensitive to temperature, which causes
corruptions in data and, therefore, prevents any operational production
in the ground system. The solution elaborated by the ISRO (in charge of
the satellite), to decrease the memory temperature down to an
operational point, is to switch off equipment for 2 orbits and switch on
for more than one orbit (140mn). This pattern is repeated every 3
orbits. Currently, the situation is stable. As shown in the 2 graphs in
the document, the data completeness (blue curve) is around 30% and the overall quality is comparable to the situation before the anomaly.
NB: the period is not the same for SCARAB and SAPHIR because SCARAB was OFF at the beginning of the year.
