Ion and electron heating during magnetic reconnection in weakly collisional plasmas
Ion and electron heating during magnetic reconnection in weakly collisional plasmas
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DOI：
10.1017/s002237781400107x
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发表时间：
2014-06
影响因子：
2.5
通讯作者：
R. Numata;N. Loureiro
中科院分区：
文献类型：
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作者：
R. Numata;N. Loureiro
用陀螺动力学模拟方法研究了强磁化弱碰撞等离子体中离子和电子的磁重联和相关加热。结果表明，大量释放的磁能通过相混合被耗散，产生（不可逆的）电子和离子加热。电子加热主要发生在磁岛而非电流片，发生在动态重联阶段之后。离子加热只有在高β等离子体中才能与电子加热相媲美，并且是由于有限拉莫尔半径（FLR）效应导致的平行和垂直相混合的结果；在空间中，离子加热主要局限于次级岛（等离子体）的内部，这是由电流片的不稳定性引起的。
Magnetic reconnection and associated heating of ions and electrons in strongly magnetized, weakly collisional plasmas are studied by means of gyrokinetic simulations. It is shown that an appreciable amount of the released magnetic energy is dissipated to yield (irreversible) electron and ion heating via phase mixing. Electron heating is mostly localized to the magnetic island, not the current sheet, and occurs after the dynamical reconnection stage. Ion heating is comparable to electron heating only in high-β plasmas, and results from both parallel and perpendicular phase mixing due to finite Larmor radius (FLR) effects; in space, ion heating is mostly localized to the interior of a secondary island (plasmoid) that arises from the instability of the current sheet.