| Issue |
J. Space Weather Space Clim.
Volume 14, 2024
|
|
|---|---|---|
| Article Number | 35 | |
| Number of page(s) | 19 | |
| DOI | https://doi.org/10.1051/swsc/2024032 | |
| Published online | 13 November 2024 | |
Technical Article
ARAMIS: a Martian radiative environment model built from GEANT4 simulations
1
Centre National d’Études Spatiales (CNES), 18 Avenue Edouard Belin, 31400 Toulouse, France
2
TRAD Tests & Radiations, 907 Voie L’Occitane, 31670 Labège, France
3
RESTORE, UMR 1301-Inserm 5070-CNRS EFS, Université de Toulouse, 4 bis Avenue Hubert Curien, 31100 Toulouse, France
4
ISAE-SUPAERO, Université de Toulouse, 10, Avenue Marc Pélegrin, 31055 Toulouse, France
5
Institut de Médecine et Physiologie Spatiale (MEDES), 2 Avenue de l’aérodrome de Montaudran, 31405 Toulouse, France
* Corresponding author: gabin.charpentier2@cnes.fr; gabincharpentier@gmail.com
Received:
23
February
2024
Accepted:
25
September
2024
A new model of the Martian surface radiative environment has been built: Atmospheric RAdiation Model for Ionizing spectra on martian Surface (ARAMIS). Based on Monte Carlo calculations, it offers high computational flexibility for surface flux spectra with several GEANT4 physics lists tested for different exposures and mission scenarios. ARAMIS performs Monte Carlo simulations independently of any exposure scenario to determine a surface response function that can then be convolved to any input spectrum, avoiding simulation repetition while maintaining results accuracy, using a parametric atmosphere geometry. In particular, the adopted approach enables secondary spectra to be discriminated by type and origin, in order to observe the impact of different primary flux components on the surface dose calculation. The ARAMIS model has been validated with experimental measurements from the RAD (Radiation Assessment Detector) instrument on board the Mars Science Laboratory (MSL) Curiosity rover, and benchmarked against other models in the literature. Built using version 11.1.0 of the GEometry ANd Tracking (GEANT4) toolbox and established models of Galactic Cosmic Ray (GCR) or Solar Particle Event (SEP) spectra, the surface neutron and photon spectra provided by ARAMIS show a better agreement than other models with high-energy experimental data, reducing model uncertainty for radiation protection calculations.
Key words: Radiation / Martian surface / Monte Carlo / Human spaceflight
© G. Charpentier et al., Published by EDP Sciences 2024
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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