THEMIS Na exosphere observations of Mercury and their correlation with in-situ magnetic field measurements by MESSENGER

Abstract : The Na exosphere of Mercury is being studied since its discovery in mid ’80s from Earth-based telescopes, and it has revealed a high dynamics and variability. Although the processes and their relationships characterising the Hermean exosphere generation and dynamics are still not exhaustively understood, there are no doubts on a tight interconnection among the planet's surface, exosphere, intrinsic magnetic field, the Solar Wind and the Interplanetary Magnetic Field (IMF). Here we analyse an extended dataset of images of the exospheric Na emission, collected from 2009 to 2013, by means of the THEMIS ground- based telescope, and perform a comprehensive statistical study of the recurrent Na emission patterns, and also their potential relationship with the IMF variability. For this purpose, we take advantage of a subset (years 2011-2013) of contemporary in situ measurements of the IMF obtained by the MAG instrument on-board the MESSENGER spacecraft.
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https://hal-insu.archives-ouvertes.fr/insu-01214272
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Submitted on : Sunday, October 11, 2015 - 1:17:27 PM
Last modification on : Friday, April 5, 2019 - 8:23:35 PM

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  • HAL Id : insu-01214272, version 1

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Valeria Mangano, Stefano Massetti, Anna Milillo, Christina Plainaki, Stefano Orsini, et al.. THEMIS Na exosphere observations of Mercury and their correlation with in-situ magnetic field measurements by MESSENGER. European Planetary Science Congress 2015, Sep 2015, Nantes, France. 10, pp.EPSC2015-815, 2015. 〈insu-01214272〉

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