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| Titel |
The auroral O+ non-Maxwellian velocity distribution function revisited |
| VerfasserIn |
D. Hubert, F. Leblanc |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 15, no. 2 ; Nr. 15, no. 2, S.249-254 |
| Datensatznummer |
250012633
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| Publikation (Nr.) |
 copernicus.org/angeo-15-249-1997.pdf |
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| Zusammenfassung |
| New characteristics of O+ ion velocity distribution functions in a background of atomic
oxygen neutrals subjected to intense external electromagnetic forces are
presented. The one dimensional (1-D) distribution function along the magnetic
field displays a core-halo shape which can be accurately fitted by a two
Maxwellian model. The Maxwellian shape of the 1-D distribution function around a
polar angle of 21 ± 1° from the magnetic field direction
is confirmed, taking into account the accuracy of the Monte Carlo simulations.
For the first time, the transition of the O+ 1-D
distribution function from a core halo shape along the magnetic field direction
to the well-known toroidal shape at large polar angles, through the Maxwellian
shape at polar angle of 21 ± 1° is properly explained
from a generic functional of the velocity moments at order 2 and 4. |
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