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Detecting Upward Directed Charged Particle Fluxes in the Mars Science Laboratory Radiation Assessment Detector

Appel, J. K. and Köhler, J. and Guo, J. and Ehresmann, B. and Zeitlin, C. and Matthiä, Daniel and Lohf, H. and Wimmer-Schweingruber, R. F. and Hassler, D. and Brinza, D. E. and Böhm, E. and Böttcher, S. and Martin, C. and Burmeister, S. and Reitz, G. and Rafkin, S. and Posner, A. and Peterson, J. and Weigle, G. (2018) Detecting Upward Directed Charged Particle Fluxes in the Mars Science Laboratory Radiation Assessment Detector. Earth and Space Science, 5 (1), pp. 2-18. American Geophysical Union (AGU). DOI: 10.1002/2016ea000240 ISSN 2333-5084

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Official URL: http://dx.doi.org/10.1002/2016ea000240

Abstract

The Mars Science Laboratory rover Curiosity, operating on the surface of Mars, is exposed to radiation fluxes from above and below. Galactic Cosmic Rays travel through the Martian atmosphere, producing a modified spectrum consisting of both primary and secondary particles at ground level. These particles produce an upward directed secondary particle spectrum as they interact with the Martian soil. Here we develop a method to distinguish the upward and downward directed particle fluxes in the Radiation Assessment Detector (RAD) instrument, verify it using data taken during the cruise to Mars, and apply it to data taken on the Martian surface. We use a combination of Geant4 and Planetocosmics modeling to find discrimination criteria for the flux directions. After developing models of the cruise phase and surface shielding conditions, we compare model-predicted values for the ratio of upward to downward flux with those found in RAD observation data. Given the quality of available information on Mars Science Laboratory spacecraft and rover composition, we find generally reasonable agreement between our models and RAD observation data. This demonstrates the feasibility of the method developed and tested here. We additionally note that the method can also be used to extend the measurement range and capabilities of the RAD instrument to higher energies.

Item URL in elib:https://elib.dlr.de/119263/
Document Type:Article
Title:Detecting Upward Directed Charged Particle Fluxes in the Mars Science Laboratory Radiation Assessment Detector
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Appel, J. K.Institute for Experimental and Applied Physics, University of Kiel, Germany; appel (at) physik.uni-kiel.dehttps://orcid.org/0000-0002-4284-002X
Köhler, J.Institute for Experimental and Applied Physics, University of Kiel, Germany and Thales Electronic Systems GmbH, Kiel, GermanyUNSPECIFIED
Guo, J.Institute for Experimental and Applied Physics, University of Kiel, GermanyUNSPECIFIED
Ehresmann, B.Southwest Research Institute, Boulder, CO, USAUNSPECIFIED
Zeitlin, C.Lockheed Martin Information Systems & Global Solutions, Houston, TX, USAUNSPECIFIED
Matthiä, DanielRadiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany; Daniel.Matthiae (at) dlr.dehttps://orcid.org/0000-0003-1507-0143
Lohf, H.Institute for Experimental and Applied Physics, University of Kiel, GermanyUNSPECIFIED
Wimmer-Schweingruber, R. F.Institute for Experimental and Applied Physics, University of Kiel, GermanyUNSPECIFIED
Hassler, D.Southwest Research Institute, Boulder, CO, USAUNSPECIFIED
Brinza, D. E.Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USAUNSPECIFIED
Böhm, E.Institute for Experimental and Applied Physics, University of Kiel, GermanyUNSPECIFIED
Böttcher, S.Institute for Experimental and Applied Physics, University of Kiel, GermanyUNSPECIFIED
Martin, C.Institute for Experimental and Applied Physics, University of Kiel, GermanyUNSPECIFIED
Burmeister, S.Institute for Experimental and Applied Physics, University of Kiel, GermanyUNSPECIFIED
Reitz, G.Radiation Biology Department, Institute of Aerospace Medicine, German Aerospace Center (DLR), Cologne, Germany; Guenther.Reitz (at) dlr.dehttps://orcid.org/0000-0001-5045-0761
Rafkin, S.Southwest Research Institute, Boulder, CO, USAUNSPECIFIED
Posner, A.Science Mission Directorate, NASA Headquarters, Washington, DC, USAUNSPECIFIED
Peterson, J.Southwest Research Institute, Boulder, CO, USAUNSPECIFIED
Weigle, G.Big Head Endian, LLC, Burden, KS, USAUNSPECIFIED
Date:23 January 2018
Journal or Publication Title:Earth and Space Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:5
DOI :10.1002/2016ea000240
Page Range:pp. 2-18
Publisher:American Geophysical Union (AGU)
ISSN:2333-5084
Status:Published
Keywords:MSL Radiation, Radiation Assessment Detector (RAD)
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 - Vorhaben MSL-Radiation, R - Vorhaben Strahlenbiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:23 Mar 2018 08:28
Last Modified:14 Dec 2019 04:24

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