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Assessment of Galactic Cosmic Ray models

Mrigakshi, Alankrita Isha and Matthiä, Daniel and Berger, Thomas and Reitz, Guenther and Wimmer-Schweingruber, Robert F. (2012) Assessment of Galactic Cosmic Ray models. Journal of Geophysical Research, 117 (A08109), 12 -PP. American Geophysical Union. DOI: 10.1029/2012JA017611.

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Among several factors involved in the development of a manned space mission concept, the astronauts' health is a major concern that needs to be considered carefully. Galactic Cosmic Rays (GCRs), which mainly consist of high-energetic nuclei ranging from hydrogen to iron and beyond, pose a major radiation health risk in long-term space missions. It is therefore required to assess the radiation exposure of astronauts in order to estimate their radiation risks. This can be done either by performing direct measurements or by making computer based simulations from which the dose can be derived. A necessary prerequisite for an accurate estimation of the exposure using simulations is a reliable description of the GCR spectra. The aim of this work is to compare GCR models and to test their applicability for the exposure assessment of astronauts. To achieve this, commonly used models capable of describing both light and heavy GCR particle spectra were evaluated by investigating the model spectra for various particles over several decades. The updated Badhwar-O'Neill model published in the year 2010, CREME2009 which uses the International Standard model for GCR, CREME96 and the Burger-Usoskin model were examined. Hydrogen, helium, oxygen and iron nuclei spectra calculated by the different models are compared with measurements from various high-altitude balloon and space-borne experiments. During certain epochs in the last decade, there are large discrepancies between the GCR energy spectra described by the models and the measurements. All the models exhibit weaknesses in describing the increased GCR flux that was observed in 2009-2010

Document Type:Article
Title:Assessment of Galactic Cosmic Ray models
AuthorsInstitution or Email of Authors
Mrigakshi, Alankrita Isha German Aerospace Center, Linder Hoehe, 51147 Koeln, Germany
Matthiä, Daniel German Aerospace Center, Linder Hoehe, 51147 Koeln, Germany
Berger, Thomas German Aerospace Center, Linder Hoehe, 51147 Koeln, Germany
Reitz, Guenther German Aerospace Center, Linder Hoehe, 51147 Koeln, Germany
Wimmer-Schweingruber, Robert F. Institute for Experimental and Applied Physics, Christian Albrechts University Kiel, Kiel, Germany
Journal or Publication Title:Journal of Geophysical Research
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:12 -PP
Publisher:American Geophysical Union
Keywords:Galactic Cosmic Ray Models, CREME96, CREME2009, Badhwar-O'Neill2010 and Burger-Usoskin evaluated over 4 decades, high-altitude balloon measurements, space-borne measurements
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 - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Strahlenbiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Radiation Biology
Deposited By: Kerstin Kopp
Deposited On:17 Aug 2012 11:18
Last Modified:23 Jan 2014 11:36

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