Influence of higher atmospheric pressure on the Martian radiation environment: Implications for possible habitability in the Noachian epoch
Ehresmann, B. and Burmeister, S. and Wimmer-Schweingruber, R. F. and Reitz, G. (2011) Influence of higher atmospheric pressure on the Martian radiation environment: Implications for possible habitability in the Noachian epoch. Journal of Geophysical Research, 116 / epub ahead of print (A10106). American Geophysical Union. DOI: 10.1029/2011JA016616 .
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The Noachian epoch (∼4.5–3.5 billion years ago) is a promising era for a possible emergence of life on Mars. The presence of runoff channels in areas formed during the Noachian suggests that liquid water existed at least sporadically during that time, with liquid water being regarded as a prerequisite for life. To have sustained liquid water, the atmospheric pressure on Noachian Mars must have been significantly higher than in the present. When considering the possibility of life on Noachian Mars, one conceivable restriction is given by the ionising radiation environment. Using PLANETOCOSMICS- and Geant4-simulation codes, we calculate the radiation environment on the Martian surface and the resulting radiation exposure for different atmospheric conditions. Here, we present absorbed dose and dose equivalent rates resulting from galactic-cosmic-proton and alpha-particle-induced radiation environments, as well as changes of these rates caused by an increase of atmospheric pressure.
|Title:||Influence of higher atmospheric pressure on the Martian radiation environment: Implications for possible habitability in the Noachian epoch|
|Journal or Publication Title:||Journal of Geophysical Research|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Volume:||116 / epub ahead of print|
|Publisher:||American Geophysical Union|
|Keywords:||Noachian radiation environment, Mars, ionising radiation environment, higher atmospheric pressure, PLANETOCOSMICS- and Geant4-simulation codes|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Raumfahrt|
|HGF - Program Themes:||R FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Raumfahrt|
|DLR - Program:||R FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||R - Vorhaben Strahlenbiologie|
|Institutes and Institutions:||Institute of Aerospace Medicine > Radiation Biology|
|Deposited By:||Kerstin Kopp|
|Deposited On:||15 Dec 2011 14:22|
|Last Modified:||26 Mar 2013 13:34|
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