The background in a high earth orbit as measured by the soft γ-ray telescope SIGMA

Details The background in a high earth orbit as measured by the soft γ-ray telescope SIGMA The background in a high earth orbit as measured by the soft γ-ray telescope SIGMA

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nimpa.321..598l&link_type=abstract

Nuclear Instruments and Methods in Physics Research Section A, Volume 321, Issue 3, p. 598-608.

Physics

4

Scientific paper

High detector background level is the major obstacle encountered in astronomical observations in the hard X- and γ-ray waveband. Progresses have been made in understanding and modelling the background in the space environment, particularly at LEO helped by valuable data obtained by instruments operating in such orbits. Telescope operating in a HEO is facing a different radiation environment, hence it is expected that its background will differ from what is known in the LEO. The measurements by the SIGMA telescope provide us the first opportunity to assess all aspects of the background of a soft γ-ray detector operating in a HEO, these include: the overall background level, its composition and stability, the effects of trapped radiation and solar activities, and the prominent background lines. Comparing to the backgrounds of detectors operating in LEOs, it shows that the HEO is a very competitive orbit for γ-ray observations from the point of view of the expected background level, and with the advantage of long and uninterrupted observations time and better sky coverage.

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