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| Titel |
Vlasov simulations of trapping and loss of auroral electrons |
| VerfasserIn |
H. Gunell, L. Andersson, J. De Keyser, I. Mann |
| 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 ; 33, no. 3 ; Nr. 33, no. 3 (2015-03-04), S.279-293 |
| Datensatznummer |
250121171
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| Publikation (Nr.) |
 copernicus.org/angeo-33-279-2015.pdf |
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| Zusammenfassung |
| The plasma on an auroral field line is simulated using
a Vlasov model. In the initial state, the acceleration
region extends from one to three Earth radii in altitude
with about half of the acceleration voltage
concentrated in a stationary double layer
at the bottom of this region.
A population of electrons is trapped between the double
layer and their magnetic mirror points at lower altitudes.
A simulation study is carried out to examine the
effects of fluctuations in the total accelerating
voltage, which may be due to changes in the generator
or the load of the auroral current circuit.
The electron distribution function on the high potential
side of the double layer changes significantly depending
on whether the perturbation is toward higher or lower
voltages, and therefore measurements of electron distribution
functions provide information about the recent history of
the voltage.
Electron phase space holes are seen as a result of the
induced fluctuations.
Most of the voltage perturbation is assumed by the
double layer.
Hysteresis effects in the position of the double
layer are observed when the voltage first is lowered and then brought back
to its initial value. |
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