Mercury's helium exosphere after Mariner 10's third encounter

Details Mercury's helium exosphere after Mariner 10's third encounter Mercury's helium exosphere after Mariner 10's third encounter

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977stin...7813987c&link_type=abstract

Unknown

Physics

Helium, Mariner 10 Space Probe, Mercury (Planet), Planetary Atmospheres, Planetary Environments, Planetary Radiation, Planetary Temperature, Solar Wind

Scientific paper

From Mariner 10 third encounter UV data, a value of .00045 was calculated as the fraction of the solar wind He++ flux intercepted and captured by Mercury's magnetosphere if the observed He atmosphere is maintained by the solar wind. If an internal source for He prevails, the corresponding upper bound for the global outgassing rate is estimated to be 4.5 x 10 to the 22nd power per sec. A surface temperature distribution was used which satisfies the heat equation over Mercury's entire surface using Mariner 10 determined mean surface thermal characteristics. The means stand off distance of Mercury's magnetopause averaged over Mercury's orbit was also used.

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