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| Titel |
Venus, Earth, Mars: Comparative Ion Escape Rates |
| VerfasserIn |
Stas Barabash |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250036229
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| Zusammenfassung |
| For the solar system planets the non-thermal atmospheric escape exceeds by far the Jean
escape for particles heavier than helium. In this talk we consider only ion escape and compare
the total ion escape rates for Venus, Earth, and Mars caused by the interaction with the solar
wind. The most recent data on the escape rates based on measurements from Mars Express,
Venus Express, and Cluster show that despite large differences in the atmospheric masses (a
factor of 100 – 200), different types of the interactions with the solar wind, the escape rates
for Mars ,Venus, and the Earth are within the range 1024 - 1025s-1 . Surprisingly, the
expected shielding of the Earth atmosphere by the intrinsic magnetic field is not as
efficient as one may assume. The reason for this is the non-thermal escape caused
by the solar wind interaction is an energy – limited process. The larger Earth’s
magnetosphere intercepts and tunnels down to the ionosphere more energy from
the solar wind than more compact interaction regions of non-magnetized planets. |
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