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Theses

The Micro-ARES instrument on ExoMars 2016

Abstract : Atmosphere ionization and electrification mechanisms of various sorts are known to exist in most of the planetary environments. It appears that the lower atmosphere and surface of Mars combine a number of favorable conditions for the development of intense atmospheric electric fields. Unveiling the Martian atmospheric electricity was the original goal of Micro-ARES, the electric-field and conductivity sensor of the DREAMS meteorological suite, the only scientific payload that equipped the Schiaparelli module from the ExoMars 2016 mission.The study of the electrical activity and electric field generation in Martian dust events might bring new capital knowledge on a wide range of phenomena: The local and planetary scale dust dynamics, a major component of the Martian climate, the partially understood Martian ionosphere, atmospheric chemistry and more precisely the production and destruction of the Martian methane, a still unresolved mystery.The following thesis details the hardware and software development of Micro-ARES, its testing phases, both in laboratory and on the field, and the data processing and physical processes underlying the instrument’s operation. Since future missions may carry again these kind of polyvalent, lightweight and energy-efficient sensor, emphasis was put on the modeling of the instrument's electrical coupling with the atmosphere. This theoretical work exceeds the frame of Micro-ARES in ExoMars 2016 and is necessary in order to understand and accurately compensate the biases induced by the instrument's surroundings, its simplified design and the unexpected electrical behavior of the Martian atmosphere.
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Submitted on : Thursday, September 28, 2017 - 10:15:33 AM
Last modification on : Wednesday, June 3, 2020 - 3:10:01 AM
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  • HAL Id : tel-01596889, version 1

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Grégoire Déprez. The Micro-ARES instrument on ExoMars 2016. Astrophysics [astro-ph]. Université Pierre et Marie Curie - Paris VI, 2017. English. ⟨NNT : 2017PA066061⟩. ⟨tel-01596889⟩

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