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Cosmic ray dose Monitoring using RadFET sensors of the Rosetta instruments SESAME and COSIMA

Falke, Peter and Fischer, Hans-Herbert and Seidensticker, Klaus J. and Thiel, Klaus and Fischer, Henning and Hilchenbach, Martin and Henkel, Hartmut and Koch, Andreas (2016) Cosmic ray dose Monitoring using RadFET sensors of the Rosetta instruments SESAME and COSIMA. Acta Astronautica, 125, pp. 22-29. Elsevier. DOI: 10.1016/j.actaastro.2016.03.001 ISBN ISSN 0094-5765 ISSN 0094-5765

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Abstract

On its more than 10 years journey to comet 7P/Churyumov–Gerasimenko, Rosetta carried RadFET ionising dose monitors in the central electronics of the orbiter instrument COSIMA and the lander instrument SESAME. The readings of the dosimeters were corrected for the temperature of the devices during measurements. Because the sensitivity of RadFETs depends on the energy of impinging charged particles, a mean efficiency factor for the prevalent proton radiation was determined by applying nine efficiency models to proton energy spectra of Rosetta's radiation environment. The resulting dose profiles show linear increases of the accumulated dose with time, mainly caused by galactic cosmic radiation, and the arrival of two solar particle events in 2005. The accumulated dose (in Silicon) during 3909 days in space from 2004-03-02 to 2014-11-14 was 3.2 ± 0.6 Gy in case of COSIMA and 1.9 ± 0.4 Gy for SESAME. The deviation of the two measurements is mainly due to the solar particle event in September 2005, which had a 5.3 ±1.0 times stronger impact on the COSIMA RadFET. Measured dose levels are one order of magnitude lower than those expected before launch for not being exceeded on the 90% confidence level, which is mainly due to the low solar activity during the mission so far.

Item URL in elib:https://elib.dlr.de/105273/
Document Type:Article
Title:Cosmic ray dose Monitoring using RadFET sensors of the Rosetta instruments SESAME and COSIMA
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Falke, PeterDLR KölnUNSPECIFIED
Fischer, Hans-HerbertHans-Herbert.Fischer (at) dlr.deUNSPECIFIED
Seidensticker, Klaus J.Klaus.Seidensticker (at) dlr.dehttps://orcid.org/0000-0003-3671-3769
Thiel, KlausUniversität zu Köln, Abteilung NuklearchemieUNSPECIFIED
Fischer, HenningMax-Planck-Institut für Sonnensystemforschung GöttingenUNSPECIFIED
Hilchenbach, MartinUniversität zu Köln, Abteilung NuklearchemieUNSPECIFIED
Henkel, Hartmutvon Hoerner & Sulger GmbH SchwetzingenUNSPECIFIED
Koch, Andreasvon Hoerner & Sulger GmbH SchwetzingenUNSPECIFIED
Date:August 2016
Journal or Publication Title:Acta Astronautica
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:125
DOI :10.1016/j.actaastro.2016.03.001
Page Range:pp. 22-29
Publisher:Elsevier
ISSN:0094-5765
ISBN:ISSN 0094-5765
Status:Published
Keywords:RadFET, Ionising dose, Rosetta, Philae, COSIMA, SESAME
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Projekt ROSETTA Instrumente
Location: Berlin-Adlershof , Köln-Porz
Institutes and Institutions:Space Operations and Astronaut Training > User center for space experiments (MUSC)
Institute of Planetary Research > Asteroids and Comets
Deposited By: Herrmann, Astrid
Deposited On:18 Jul 2016 12:07
Last Modified:31 Jul 2019 20:02

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