Backscattered solar wind protons by Phobos

Details Backscattered solar wind protons by Phobos Backscattered solar wind protons by Phobos

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11510213f&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A10, CiteID A10213

Physics

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Planetary Sciences: Comets And Small Bodies: Interactions With Solar Wind Plasma And Fields, Planetary Sciences: Solar System Objects: Martian Satellites, Planetary Sciences: Solid Surface Planets: Interactions With Particles And Fields, Planetary Sciences: Solid Surface Planets: Remote Sensing, Planetary Sciences: Solid Surface Planets: Physical Properties Of Materials

Scientific paper

We report Mars Express (MEX) measurements showing that the regolith-covered Phobos surface backscatters 0.5%-10% of the impinging solar wind protons. Backscattered protons with an energy corresponding to 30%-40% of the solar wind energy injected in the flow are picked up by the solar wind and may cause field disturbances and wave activity. Since a similar backscattering of solar wind protons was observed and reported at the Moon, the backscattering of the solar wind particles is a typical physical process for regolith-covered bodies in space, even though the regolith is highly porous and it has been thought that almost 100% of the solar wind protons are implanted.

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