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MoMo: a new empirical model of the Mars ionospheric total electron content based on Mars Express MARSIS data

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Bergeot, Nicolas [Solar-Terrestrial Centre of Excellence (STCE), Space Pole, 1180 Brussels, Belgium] Witasse, Olivier [European Space Agency, ESTEC-Scientific Support Office, ESTEC, 2201 AZ Noordwijk, The Netherlands] Le Maistre, Sébastien [Royal Observatory of Belgium Brussels, 1180 Uccle, Belgium] Blelly, Pierre-Louis [Institut de Recherche en Astrophysique et Planétologie (IRAP), 31400 Toulouse, France] Kofman, Wlodek [Université Grenoble Alpes, CNRS, CNES, IPAG, 38400 Grenoble, France] Dehant, Véronique [UCL] Chevalier, Jean-Marie [Solar-Terrestrial Centre of Excellence (STCE), Space Pole, 1180 Brussels, Belgium]

(eng) Aims: Several scientific landers and rovers have reached the Martian surface since the 1970s. Communication between the asset (i.e., lander or rover) and Mars orbiters or Earth antennas uses radio signals in UHF to X-band frequencies passing through the Mars’ ionosphere. It is consequently necessary to take into account electron density variation in the Mars’ ionosphere to correct the refraction of the signal transmitted. Methods: We developed a new empirical model of the Mars’ ionosphere called MoMo. It is based on the large database of Total Electron Content (TEC) derived from the subsurface mode of the Mars Express MARSIS radar. The model provides vertical TEC as a function of solar zenith angle, solar activity, solar longitude and location. For validation, the model is compared with Mars Express radio occultation data as well as with the numerical model IPIM (IRAP Plasmasphere-Ionosphere Model). Results: We discussed the output of the model in terms of climatology behaviour of the Mars’ ionosphere. The output of MoMo is then uses to quantify the impact of the Martian ionosphere for radio-science experiments. From our results, the effect is of the order of 10−3 mm s−1 in Doppler observables especially around sunrise and sunset. Consequently, this new model could be used to support the data analysis of any radio-science experiment and especially for present InSight RISE and futur ExoMars LARA instruments aiming at better understand the deep-interior of Mars.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès libre
Publication date 2019
Language Anglais
Journal information "Journal of Space Weather and Space Climate" - Vol. 9, p. A36 (2019)
Peer reviewed yes
Publisher EDP Sciences (Les Ulis)
issn 2115-7251
e-issn 2115-7251
Publication status Publié
Affiliation UCL - SST/ELI/ELIC - Earth & Climate
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Bibliographic reference Bergeot, Nicolas ; Witasse, Olivier ; Le Maistre, Sébastien ; Blelly, Pierre-Louis ; Kofman, Wlodek ; et. al. MoMo: a new empirical model of the Mars ionospheric total electron content based on Mars Express MARSIS data. In: Journal of Space Weather and Space Climate, Vol. 9, p. A36 (2019)
Permanent URL http://hdl.handle.net/2078.1/220963