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| Titel |
Proton fire hose instabilities in the expanding solar wind: Role of oblique magnetic field |
| VerfasserIn |
Petr Hellinger |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250127493
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| Publikation (Nr.) |
 EGU/EGU2016-7376.pdf |
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| Zusammenfassung |
| The double adiabatic (CGL) approximation for the ideal (Parker) interplanetary magnetic
field (IMF) predicts generation of the parallel particle temperature anisotropy (T∥ > T⊥) for
a nearly radial magnetic field whereas for a strongly oblique IMF generation of the opposite
temperature anisotropy is expected. The transition between the two behaviours is expected at
around 45o, i.e. around 1 AU in the solar wind in the ecliptic plane. We investigate properties
of a proton-electron plasma system in the solar wind using hybrid expanding box simulations
starting with an oblique IMF. The simulated system becomes unstable with respect
to the parallel and oblique fire hose instabilities and is forced to stay around the
corresponding marginal stability. Rotation of the IMF reduces the time system stays
near the marginal stability regions and for a strongly transverse IMF the system
moves away from the regions unstable with respect to the fire hose instabilities. |
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