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The Pivot Energy of Solar Energetic Particles Affecting the Martian Surface Radiation Environment

Guo, Jingnan and Wimmer-Schweingruber, Robert F. and Wang, Yuming and Grande, Manuel and Matthiä, Daniel and Zeitlin, Cary and Ehresmann, Bent and Hassler, Donald M. (2019) The Pivot Energy of Solar Energetic Particles Affecting the Martian Surface Radiation Environment. Astrophysical Journal Letters, 883 (1), L12. Institute of Physics (IOP) Publishing. doi: 10.3847/2041-8213/ab3ec2. ISSN 2041-8205.

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Official URL: http://dx.doi.org/10.3847/2041-8213/ab3ec2

Abstract

Space radiation is a major risk for humans, especially on long-duration missions to outer space, e.g., a manned mission to Mars. Galactic cosmic rays contribute a predictable radiation background; the main risk is due to the highly variable and currently unpredictable flux of solar energetic particles (SEPs). Such sporadic SEP events may induce acute health effects and are thus considered a critical mission risk for future human exploration of Mars. Therefore, it is of the utmost importance to study, model, and predict the surface radiation environment during such events. It is well known that the deep-space SEP differential energy spectrum at high energies is often given by a power law. We use a measurement-validated particle transport code to show that, for large SEP events with proton energy extending above ∼500 MeV with a power-law distribution, it is sufficient to measure the SEP flux at a pivot energy of ∼300 MeV above the Martian atmosphere to predict the dose rate on the Martian surface. In conjunction with a validation by in situ measurements from the Martian surface, this remarkable simplification and elegant quantification could enable instant predictions of the radiation environment on the surface of Mars upon the onset of large SEP events.

Item URL in elib:https://elib.dlr.de/129601/
Document Type:Article
Title:The Pivot Energy of Solar Energetic Particles Affecting the Martian Surface Radiation Environment
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Guo, JingnanSchool of Earth and Space Sciences, University of Science and Technology, China; CAS Center for Excellence in Comparative Planetology, Hefei, People’s Republic of China; Institute of Experimental and Applied Physics, CAU, Kiel, Germany; jnguo (at) ustc.edu.cnUNSPECIFIED
Wimmer-Schweingruber, Robert F.Institute of Experimental and Applied Physics, Christian-Albrechts-University, Kiel, GermanyUNSPECIFIED
Wang, YumingSchool of Earth and Space Sciences, University of Science and Technology of China, Hefei, People’s Republic of China and CAS Center for Excellence in Comparative Planetology, Hefei, People’s Republic of ChinaUNSPECIFIED
Grande, ManuelUniversity of Aberystwyth, Aberystwyth, UKUNSPECIFIED
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
Zeitlin, CaryLeidos Innovations Corporation, Houston, TX, USAUNSPECIFIED
Ehresmann, BentPlanetary Science Division, Southwest Research Institute, Boulder, CO, USAUNSPECIFIED
Hassler, Donald M.Planetary Science Division, Southwest Research Institute, Boulder, CO, USAUNSPECIFIED
Date:20 September 2019
Journal or Publication Title:Astrophysical Journal Letters
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:883
DOI:10.3847/2041-8213/ab3ec2
Page Range:L12
Publisher:Institute of Physics (IOP) Publishing
ISSN:2041-8205
Status:Published
Keywords:Solar energetic particles; Space weather; Cosmic rays; Mars; Solar-planetary interactions; Particle physics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kopp, Kerstin
Deposited On:30 Oct 2019 15:00
Last Modified:30 Oct 2019 15:00

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