Abstract
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.
Original language | English (US) |
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Pages (from-to) | 773-782 |
Number of pages | 10 |
Journal | Nonlinear Processes in Geophysics |
Volume | 15 |
Issue number | 5 |
DOIs | |
State | Published - Sep 3 2008 |
ASJC Scopus subject areas
- Statistical and Nonlinear Physics
- Geophysics
- Geochemistry and Petrology