Protons precipitation onto the Martian atmosphere: Mars Express observations

Details Protons precipitation onto the Martian atmosphere: Mars Express observations Protons precipitation onto the Martian atmosphere: Mars Express observations

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p11b1217d&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #P11B-1217

Physics

[2455] Ionosphere / Particle Precipitation, [2780] Magnetospheric Physics / Solar Wind Interactions With Unmagnetized Bodies, [6225] Planetary Sciences: Solar System Objects / Mars

Scientific paper

It is the first study of the intrusion of the solar wind protons into the Martian atmosphere. Using data of the ASPERA-3/Mars Express instrument, we have studied two orbits where the H+ precipitation happened on the dayside close to the subsolar point. We have shown that: a part of the observed protons indeed precipitates, above weak and/or cusp-like crustal magnetic anomalies, even for a nominal solar wind, and we have measured energy fluxes and particle fluxes of 108-109 eV/cm2/s and 105-106 H+/cm2/s, respectively. The proton precipitation is a kinetic effect due to a small size of the Martian magnetosheath with respect to the proton gyroradius.

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