Statistics
Scientific paper
May 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusmsm34a..02d&link_type=abstract
American Geophysical Union, Spring Meeting 2007, abstract #SM34A-02
Statistics
2134 Interplanetary Magnetic Fields, 2159 Plasma Waves And Turbulence, 2780 Solar Wind Interactions With Unmagnetized Bodies
Scientific paper
The escape of particles from planetary atmospheres, especially hydrogen, is an important key towards understanding the atmospheric composition and evolution over the lifetime of the solar system. For an unmagnetized planet such as Venus or Mars when the neutral exosphere extends into the flowing solar wind plasma, loss of pick-up ions can play a significant role. Cyclotron waves from pick-up hydrogen in the solar wind have been previously observed at Mars but not at Venus. Here we report proton-cyclotron waves seen well upstream from the planet both outside and inside the planetary foreshock region, giving direct evidence that the solar wind is removing hydrogen from the planetary exosphere. Properties of the wave-occurrences are extensively studied and statistics are shown, i.e. specific aspects of the spectra, analysis in the magnetic field principal axes system, direction of propagation. The proton cyclotron waves appear to be intermittent; moreover, from PVO observations there were not reported. This raises the question why the situation at Venus is so different from Mars.
Delva Magda
Russell Christopher T.
Volwerk Martin
Wei Hongduo
Zhang Tianmeng
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