Mapping of the cusp plasma precipitation on the surface of Mercury

Details Mapping of the cusp plasma precipitation on the surface of Mercury Mapping of the cusp plasma precipitation on the surface of Mercury

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icar..166..229m&link_type=abstract

Icarus, Volume 166, Issue 2, p. 229-237.

Physics

21

Mercury, Magnetosphere, Solar Wind, Magnetic Field

Scientific paper

The presence of a magnetosphere around Mercury plays a fundamental role on the way the solar wind plasma interacts with the planet. Since the observations suggest that Mercury should occupy a large fraction of its magnetosphere and because of lack of an atmosphere, significant differences in solar wind-magnetosphere coupling are expected to exist with respect to the Earth case. On the basis of a modified Tsyganenko T96 model we describe the geometry of the magnetic field that could characterize Mercury, and its response to the variations of the impinging solar wind and of the interplanetary magnetic field. The investigation is focused on the shape and dimension of the open magnetic field regions (cusps) that allow the direct penetration of magnetosheath plasma through the exosphere of Mercury, down to its surface. The precipitating particle flux and energy are evaluated as a function of the open field line position, according to different solar wind conditions. A target of this study is the evaluation of the sputtered particles from the crust of the planet, and their contribution to the exospheric neutral particle populations. Such estimates are valuable in the frame of a neutral particle analyser to be proposed on board of the ESA/BepiColombo mission.

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