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Chaotic motion of relativistic electrons driven by whistler waves

G V Khazanov, A A Telnikhin, Tatiana K Kronberg2007年Plasma Physics and Controlled FusionIF 2.2出版社

Canonical equations governing an electron motion in the electromagnetic field of the whistler mode waves propagating along the direction of an ambient magnetic field are derived. The physical processes on which the equations of motion are based are identified. It is shown that relativistic electrons interacting with these fields demonstrate chaotic motion, which is accompanied by particle stochastic heating and significant pitch angle diffusion. Evolution of distribution functions is described by the Fokker–Planck–Kolmogorov equations. It is shown that the whistler mode waves could provide a viable mechanism for stochastic energization of electrons with energies of up to 50 MeV in the Jovian magnetosphere.

日本語訳

ホイスラー・モード波の電磁場中での電子の運動を支配する正準方程式を、周囲の磁場に沿って伝播する場合について導出した。運動方程式の基礎となる物理過程を特定した。これらの場と相互作用する相対論的電子がカオス運動を示すことを明らかにし、それに伴う粒子の確率的加熱と有意なピッチ角拡散が生じることを示した。分布関数の時間発展はフォッカー=プランク=コルモゴロフ方程式によって記述される。ホイスラー・モード波が、木星磁気圏において最大50 MeVのエネルギーを持つ電子の確率的加速の有力なメカニズムを提供し得ることを示した。

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