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document title / titre du document TRP W ORK PLAN ... - emits - ESA

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<strong>TRP</strong> Work Plan 2005-2007<br />

Description of Activities<br />

TEC-SB/7935/dc<br />

12/Feb/09<br />

<strong>TRP</strong> Reference: 04/K25<br />

Title:<br />

Martian radiation environment models<br />

The aim of this activity is to pro<strong>du</strong>ce dynamic models of the radiation environment on and around Mars.<br />

Due to the rarity of its atmosphere, the surface of Mars is exposed to large fraction of the incoming cosmic ray heavy ions,<br />

solar X-rays and ultraviolet radiation and, <strong>du</strong>ring solar active periods, to large fluxes of energetic solar charged particles.<br />

Adding to these, there is a contribution from secondary particles generated by nuclear reactions either in the atmosphere or<br />

on the Martian surface, neutrons being of particular concern.<br />

The following features will be addressed:<br />

- In-orbit radiation environment around Mars;<br />

- Atmospheric attenuation of incoming radiation<br />

(utilising the existing dynamic models of the Martian atmosphere);<br />

- Surface contours and altitude variations;<br />

- Effects of <strong>du</strong>st storms to radiation propagation;<br />

- Particle absorption and backscattering from the surface, taking into account the<br />

latest results on the water content and the elemental composition of the local soil;<br />

- Local pockets of magnetic fields in the southern hemisphere of the planet,<br />

and their potential radiation shielding effect.<br />

The study shall utilize the new data from Rosetta SREM instrument. The models shall enable input of galactic cosmic ray and<br />

solar event particle spectra as chosen by the user. The particle transport software shall utilise the open-source Geant4 toolkit<br />

and be implemented in an easy-to-use WWW-based engineering environment. Interface to the existing Mars environment<br />

data base<br />

(http://www-mars.lmd.jussieu.fr/mars/live_access.html)<br />

could be considered.<br />

Deliverables:<br />

New WWW-based, easy-to-use engineering models and software for Martian radiation environment prediction.<br />

Current TRL:<br />

Target TRL:<br />

Application Need/Date: SW operational (updated<br />

TRL1<br />

TRL3<br />

model) >2007<br />

Application/Mission: Aurora missions phase B from 2007. Contract Duration: 18 months<br />

SW Clause : - Dossier0 Ref.: T-16<br />

Consistency with Harmonisation<br />

Roadmap and Conclusions:<br />

Page 78 of 227

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