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Particle acceleration and heating in a turbulent solar corona

Loukas Vlahos, Heinz Isliker2019年Plasma Physics and Controlled FusionIF 2.2出版社

Turbulence, magnetic reconnection, and shocks can be present in explosively unstable plasmas, forming a new electromagnetic environment, which we call here turbulent reconnection, and where spontaneous formation of current sheets takes place. We will show that the heating and the acceleration of particles is the result of the synergy of stochastic (second order Fermi) and systematic (first order Fermi) acceleration inside fully developed turbulence. The solar atmosphere is magnetically coupled to a turbulent driver (the convection zone), therefore the appearance of turbulent reconnection in the solar atmosphere is externally driven. Turbulent reconnection, once it is established in the solar corona, drives the coronal heating and particle acceleration.

日本語訳

乱流、磁気リコネクション、および衝撃波は、爆発的に不安定なプラズマ中に存在し得るものであり、ここで我々が「乱流的リコネクション」と呼ぶ新たな電磁環境を形成する。そこでは、電流シートの自発的な形成が生じる。我々は、粒子の加熱と加速が、完全に発達した乱流内部における確率的(第二次フェルミ)加速と系統的(第一次フェルミ)加速の相乗効果の結果であることを示す。太陽大気は、乱流的な駆動源(対流層)と磁気的に結合しているため、太陽大気における乱流的リコネクションの出現は外部から駆動されるものである。乱流的リコネクションは、ひとたび太陽コロナにおいて確立されると、コロナ加熱と粒子加速を駆動する。

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