Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/5.4.1/doc/lccorr/node11.html
Дата изменения: Fri Jan 10 22:37:47 2003
Дата индексирования: Sat Dec 22 08:21:24 2007
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XMM-Newton Science Analysis System


lccorr (lccorr-2.0.5) [xmmsas_20030110_1802-5.4.1]

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. 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.