Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998spie.3445..566g&link_type=abstract
Proc. SPIE Vol. 3445, p. 566-577, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IX, Oswald H. Siegmund; Mark A. Gummin
Astronomy and Astrophysics
Astronomy
1
Scientific paper
The SUMER spectrograph on the Solar and Heliospheric Observatory utilizes two cross delay-line (XDL) microchannel plate (MCP) photon counting detectors. Detailed housekeeping telemetry from SUMER allow us to track many characteristics of its in-orbit detector behavior. Since there is a finite quantity of charge that can be extracted form an MCP detector, we observe some variation in the response of such a detector over the course of its lifetime. Information from the housekeeping data reveals the expected variation in gain for both spectral and spatial dimensions. We also present SUMER history memory files which illustrate the pattern of count extraction arising from repeated observations of emission line spectra. In addition, we compare pre-flight and in-flight flat fields for both SUMER detectors. The in- flight flat fields include features corresponding to regions of high charge extraction. Evidence for displacement of low gain events is also presented, and the importance of performing a pre-launch MCP 'scrub' is emphasized.
Airieau Sabine
Griffiths Neil W.
Siegmund Oswald H.
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