Status of eumetsat polar System (eps)



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#69075
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IASI Moon intrusion

Periodically, the Moon can enter the Field of View of the IASI instrument. This generally occurs for a few minutes on several successive orbits. If the Moon Enters the FOV during Normal Operation, the on-board algorithms would be upset and take several days to settle. To prevent this IASI was previously commanded to External Calibration mode during the entire Moon Intrusion period, leading to an outage of ca. 1 day. However, for the Moon Intrusions on Aug 10 & 11 2009, new automated procedures were put in place that commanded the instrument into External Calibration mode just for the periods that the Moon was in the FOV. This total outage in this instance was just 9h39', compared with 1 day, 6h14' had the previous method been used.





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