arXiv 1902.015882019-02-05physics.space-phphysics.plasm-ph

空间等离子体重联起始的物理机制

Physical mechanism of reconnection onset in space plasmas

M. Ugai

摘要：

磁重联在空间等离子体中的大耗散事件中起着至关重要的作用，如太阳耀斑和地磁亚暴，但对于导致爆炸事件的重联起始一直存在很大的混乱。本文的主旨是提出重联起始的新物理概念，阐明耀斑和亚暴的物理机制。重联率可以定义为沿X中性线的感应电场，因此提出当环境重联（感应）电场有效穿透X线时，可以发生大规模重联。在没有有效库仑碰撞的日华或地磁尾中，重联电场被屏蔽（切断）在X线周围，因此重联不能发生，磁能可以以电流片的形式存储。结果表明，当等离子体在X线周围发生有效碰撞和耗散时，X线周围的重联电场屏蔽被破坏，重联急剧增长，最终导致产生耀斑和亚暴的（Petschek类）快速重联机制.

英文摘要：

Magnetic reconnection plays a crucial role in large dissipative events in space plasmas, such as solar flares and geomagnetic substorms, but there has been much confusion regarding reconnection onset responsible for the explosive events. The main theme of the present paper is to propose a new physical concept on reconnection onset and to clarify physical mechanism responsible for flares and substorms. Reconnection rate can be defined as inductive electric field along X neutral line, so it is proposed that large-scale reconnection can occur when ambient reconnection (inductive) electric fields effectively penetrate into X line. In the solar corona or geomagnetic tail without effective Coulomb collision, reconnection electric fields are shielded (cut off) around X line, so reconnection cannot occur and magnetic energy can be stored in the form of current sheets. It is demonstrated that when plasmas become effectively collisional and dissipative around X line, shielding of reconnection electric fields around X line is violated, and reconnection drastically grows to eventually cause the (Petschek-like) fast reconnection mechanism responsible for flares and substorms.

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摘要：

英文摘要：

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