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| Titel |
Phobos 2/ASPERA data revisited: Planetary ion escape rate from Mars near the 1989 solar maximum |
| VerfasserIn |
Robin Ramstad, Yoshifumi Futaana, Stas Barabash, Hans Nilsson, Andrei Fedorov, Sergio Martin del Campo Barraza, Rickard Lundin, Konrad Schwingenschuh |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250072070
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| Zusammenfassung |
| Insights about the near-Mars space environment from Mars Express observations have
motivated a revisit of the ASPERA-Phobos 2 ion data from 1989. The Sun’s more
active past makes the escape rate measured during the extremely high 1989 solar
maximum crucial for understanding the evolution of the Martian atmosphere. Our
escape rate analysis is expanded to include all usable heavy ion measurements (O+,
O++, O2+) from the circular orbits of Phobos 2. We used an empirical model for
the ion distribution function in the Martian tail, based on Mars Express data, to
reexamine the Phobos 2 data. The newly calculated fluxes in the Martian tail were also
recalibrated against IMP-8 measurements of the solar wind and Phobos 2-TAUS ion
measurements in the tail. Heavy ion flux measurements from 18 circular equatorial orbits
around Mars have were bin-averaged to a grid, using the MSE (electric field) frame
of reference and data from the MAGMA magnetometer. The heavy ion flux grid
reveals a disturbed Martian magnetosphere and is integrated to yield a total planetary
heavy ion escape rate of 2.2 Ã 1025Â s-1 from Mars for the 1989 solar maximum. |
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