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Communication Dans Un Congrès Année : 2021

Seasonal variations of Mg and Ca in the exosphere of Mercury

Jean-Yves Chaufray
François Leblanc
Elisabeth Werner
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Ronan Modolo
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Résumé

MESSENGER was the first mission in orbit around Mercury. During its orbital phase, the MASCS/UVVS instrument measured the temporal and spatial variations of its exosphere, and particularly the magnesium, calcium and sodium exospheric emissions. The observations show large seasonal variations, and a dawn enhancement of the brightness for calcium and magnesium. The seasonal variations of the calcium emission, and the large temperature needed to fit the observed scale height suggest impact vaporization from dust coming from an interplanetary dust disk as the main source of calcium with an additional source of dust from 2P/Encke near Mercurys true anomaly angle of 45. The large temperature needed to fit the vertical profiles of the magnesium brightness also suggest a source coming from dust but with a different seasonal pattern. In this presentation, we will compare the simulated seasonal variations of the calcium and magnesium densities from a 3D temporal exospheric model of Mercury with the UVVS observations and explain the differences between these two species.
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Dates et versions

insu-04442801 , version 1 (06-02-2024)

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Jean-Yves Chaufray, François Leblanc, Elisabeth Werner, Ronan Modolo, Sae Aizawa. Seasonal variations of Mg and Ca in the exosphere of Mercury. AGU Fall Meeting 2021, Dec 2021, New Orleans, United States. pp.id. P25F-2216. ⟨insu-04442801⟩
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