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• W2621294080 abstract "Today, the surface of Mars is an inhospitable environment for any form of life. Due to its thin atmosphere and lack of a global magnetic field, Mars is only weakly protected from charged particles impeding the planet from outer space. In particular, high-energetic galactic cosmic rays can propagate all the way through the atmosphere to the ground. These high-energetic particles create, along with secondary particles produced in the atmosphere and the soil, a surface radiation environment that can pose a possible hazard for life. To estimate this risk, the Radiation Assessment Detector (RAD) will measure the radiation exposure on the surface, as part of the Mars Science Laboratory rover mission, launched in November 2011 and slated to arrive at Mars in August 2012.Furthermore, there is substantial evidence that, early in the planet's history, conditions on Mars were much more suited for an emergence of life. Especially the Noachian period (~ 4 billion years ago) is deemed as a promising time span. The atmosphere was considerably denser and shielded by a global magnetic field, and large amounts of liquid water could be found on the surface. These factors indicate a radiation environment less dangerous for life. Thus, quantifying the radiation exposure on early Mars is of high importance for the question if life could have ever emerged there.In this thesis, the influence of higher atmospheric pressure, corresponding to a denser Noachian atmosphere, on the radiation exposure on and beneath the surface is analysed. Furthermore, the influence of the presence of larger volumes of liquid surface water and subsurface water ice on the radiation field are determined. For this, a model was developed that calculates radiation dose rates from computed particle fluxes for these conditions via Monte Carlo methods. In the scope of this work, the existing parameter space of Martian radiation research is expanded by calculating dose rates of a wide set of particle species for a broad range of environmental changes.As a second main part of this thesis, a model that mirrors an important part of RAD's onboard data processing and reduction was developed. The setup of the electronics' processing logic is explained in detail and it is described how the instrument aims to distinguish measured charged particles onboard in particles penetrating the detector and stopping in it. The model is used to determine necessary cut values for the particle distinction. Additionally, it is shown that the model is able to correctly distinguish penetrating and stopping charged particles in measured calibration data. Furthermore, findings from this research are employed to improve the processing logic." @default.
• W2621294080 created "2017-06-09" @default.
• W2621294080 creator A5053887603 @default.
• W2621294080 date "2012-04-02" @default.
• W2621294080 modified "2023-09-27" @default.
• W2621294080 title "The Martian Radiation Environment - Early Mars and Future Measurements with the Radiation Assessment Detector" @default.
• W2621294080 hasPublicationYear "2012" @default.
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