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Дата изменения: Mon Nov 22 23:32:49 2004
Дата индексирования: Sat Dec 22 08:20:38 2007
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XMM-Newton Science Analysis System


lccorr (lccorr-2.17.1) [xmmsas_20041122_1834-6.1.0]

Meta Index / Home Page / Description / Exposure corrections in detail:

treatcosmicrays

A proportion of detected events are `minimum ionising particles' (MIPs). During each ccd frame, pixels occupied by a MIP are not free to detect an xray; hence MIPs lead to xray flux loss. The fraction of affected pixels is stored in the FRACEXP column of the EXPOSUnn extensions (the `nn' indicating the ccd/node) of the event list. Note that, although this column has the same name as that used to store the total exposure in the output TS, their values are not closely related.