Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000exa....10..177h&link_type=abstract
Experimental Astronomy, v. 10, Issue 2/3, p. 177-197 (2000).
Astronomy and Astrophysics
Astronomy
3
Scientific paper
We present a trend analysis of the ISO-SWS detector performance and a study of the space radiation effects on the SWS detectors. In particular, dark currents, dark current noise and detector responses have been checked as a function of time through the mission and as a function of time in a revolution. The results show that these parameters were stable during the mission in all bands but for band 3 (Si:As). Dark currents and responses were found to be higher in the first hours following the start of the science window, especially in band 2 (Si:Ga). We have studied the impacts of cosmic rays and radiation belt particles on the SWS detectors, as well as of the only large solar proton event on November 6, 1997, that occurred during the ISO mission (operated during solar minimum). The observed glitch rates in all SWS bands are found to be between 2 and 4 times higher than the value predicted by the CREME96 model for the cosmic ray flux in the period considered. The bands that registered the highest glitch rates showed also a correlation with the electron fluxes measured on the GOES 9 spacecraft. From the distribution of glitch heights (voltage jumps in the detector signal), we have derived the deposited energy distributions of the particles hits. Our results lead to the conclusion that secondary particles produced in the shield and the detectors contributed at least as much as cosmic rays to the observed glitch rate. The effects on the detectors of the November 6, 1997 event, which caused that all observations in a revolution were declared failed, are described in detail.
Feuchtgruber Helmut
Heras Ana M.
Lahuis Fred
Leech Kieron
Lorente Rosario
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