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| Titel |
Simulating chorus generation via Particle-in-cell simulations |
| VerfasserIn |
Etienne Koen, Andrew Collier, Shimul Maharaj |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250046389
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| Zusammenfassung |
| Chorus emissions are whistler mode waves propagating through the Earth’s magnetosphere in
two distinct frequency bands, typically in the range of 0.1-0.8 fce, where fce is the equatorial
electron gyro-frequency. Chorus consists of discrete elements, which are normally rising
tones, each of which lasts for a few tenths of a second. Chorus is predominantly observed
during the onset of the substorm expansion phase when energetic electrons are injected into
the magnetosphere. As these electrons drift eastward around towards noon, their distribution
becomes unstable to the ampli?cation of whistler mode waves. It is thought that
the amplification process proceeds via the Doppler-shifted cyclotron resonance
interaction. Particle-in-cell (PIC) simulations, which simulate the motion of groups of
similar particles on a two dimensional grid subject to the self-consistent electric and
magnetic fields generated by their spatial distribution and motion, are used to simulate
the amplification of whistler-mode waves propagating along the magnetic field. A
population of electrons having a velocity distribution with a thermal anisotropy
is injected into the plasma and the growth of the resulting waves is investigated. |
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