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| Titel |
Mitigation of energetic electrons in the magnetosphere by amplified whistler wave under double cyclotron resonances |
| VerfasserIn |
S. P. Kuo |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 15, no. 5 ; Nr. 15, no. 5 (2008-10-22), S.773-782 |
| Datensatznummer |
250012763
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| Publikation (Nr.) |
 copernicus.org/npg-15-773-2008.pdf |
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| Zusammenfassung |
| An optimal approach reducing the population of MeV electrons in the
magnetosphere is presented. Under a double resonance condition, whistler
wave is simultaneously in cyclotron resonance with keV and MeV electrons.
The injected whistler waves is first amplified by the background keV
electrons via loss-cone negative mass instability to become effective in
precipitating MeV electrons via cyclotron resonance elevated chaotic
scattering. The numerical results show that a small amplitude whistler wave
can be amplified by more than 25 dB. The amplification factor reduces only
about 10 dB with a 30 dB increase of the initial wave intensity. Use of an
amplified whistler wave to scatter 1.5 MeV electrons from an initial pitch
angle of 86.5°to a pitch angle <50° is demonstrated. The ratio
of the required wave magnetic field to the background magnetic field is
calculated to be about 8×10−4. |
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