Mitigation of energetic electrons in the magnetosphere by amplified whistler wave under double cyclotron resonances

S. P. Kuo

Research output: Contribution to journalArticle

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 languageEnglish (US)
Pages (from-to)773-782
Number of pages10
JournalNonlinear Processes in Geophysics
Volume15
Issue number5
DOIs
StatePublished - Sep 3 2008

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Geophysics
  • Geochemistry and Petrology

Fingerprint Dive into the research topics of 'Mitigation of energetic electrons in the magnetosphere by amplified whistler wave under double cyclotron resonances'. Together they form a unique fingerprint.

Cite this