Recognition of Space Weather Impact on the Isophot Detectors |
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Authors: | Hector O. Castañeda Ulrich Klaas |
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Affiliation: | (1) Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany;(2) Astrophysics Division, Space Science Department of ESA, ISO Science Operations Centre, Villafranca del Castillo, P.O. Box 50727, E-28080 Madrid, Spain;(3) Instituto de Astrofisica de Canarias, E-38200 La Laguna, Spain |
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Abstract: | The effects of changes in the space environment on the ISOPHOT photoconductivedetectors over the whole ISO mission were studied using the complete setof responsivity check measurements taken after the curing of the detectors.We found that the responsivity of the Ge-based, low bias voltage far-infrared detectors (P3, C100, and C200) is sensitive to the conditions of the Space Weather.We present evidence that an increased responsivity level (20% – 50%) after curing of the detectors is linked to the onset of geomagnetic storms. TheSi-based, high bias voltage detectors P1, P2 and PHT–SS show only small changesin their responsivity. An exception is the PHT–SL array which shows a similar,but less pronounced behaviour as the FIR detectors. While these relationshave been demonstrated by our study, a detailed physical understanding is still outstanding. The Space Weather dependent scatter of the responsivity,being the photometric scaling factor (conversion from measured photo currentto inband power on the detector), justifies the observing mode design to include frequent monitoring of its actual level. |
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Keywords: | photoconductive detectors space vehicles space weather |
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