rosetta and mars express observations of the influence of high solar wind pressure on the martian plasma environment
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ID: 138734
2009
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Abstract
We report on new simultaneous in-situ observations at Mars from Rosetta and
Mars Express (MEX) on how the Martian plasma environment is affected by high
pressure solar wind. A significant sharp increase in solar wind density,
magnetic field strength and turbulence followed by a gradual increase in
solar wind velocity is observed during ~24 h in the combined data
set from both spacecraft after Rosetta's closest approach to Mars on 25
February 2007. The bow shock and magnetic pileup boundary are coincidently
observed by MEX to become asymmetric in their shapes. The fortunate orbit of
MEX at this time allows a study of the inbound boundary crossings on one side
of the planet and the outbound crossings on almost the opposite side, both
very close to the terminator plane. The solar wind and interplanetary
magnetic field (IMF) downstream of Mars are monitored through simultaneous
measurements provided by Rosetta. Possible explanations for the asymmetries
are discussed, such as crustal magnetic fields and IMF direction. In the same
interval, during the high solar wind pressure pulse, MEX observations show an
increased amount of escaping planetary ions from the polar region of Mars. We
link the high pressure solar wind with the observed simultaneous ion outflow
and discuss how the pressure pulse could also be associated with the observed
boundary shape asymmetry.
| Reference Key |
edberg2009annalesrosetta
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| Authors | ;N. J. T. Edberg;N. J. T. Edberg;U. Auster;S. Barabash;A. Bößwetter;D. A. Brain;J. L. Burch;C. M. Carr;S. W. H. Cowley;E. Cupido;F. Duru;A. I. Eriksson;M. Fränz;K.-H. Glassmeier;K.-H. Glassmeier;R. Goldstein;M. Lester;R. Lundin;R. Modolo;H. Nilsson;I. Richter;M. Samara;J. G. Trotignon |
| Journal | journal of food measurement and characterization |
| Year | 2009 |
| DOI |
10.5194/angeo-27-4533-2009
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| URL | |
| Keywords |
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