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arXiv 1203.2248physics.space-phphysics.plasm-ph
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引导场无碰撞磁重联中的三维密度腔

Three dimensional density cavities in guide field collisionless magnetic reconnection

Stefano Markidis, Giovanni Lapenta, Andrey Divin, Martin V. Goldman, D. Newman, Laila Andersson

摘要:

利用引导场进行无碰撞磁重联的粒子模拟首次揭示了沿磁重联分界线(即所谓的“空腔”)的低密度区域的三维特征。结果发现,结构与进一步较低的密度发展内的空腔。因为它们的外观类似于肋的形状,这些地层在这里被称为“低密度肋”。它们的位置在时间上保持大致固定,并且随着沿着空腔的电子流将它们排空,它们的密度逐渐减小。它们沿着磁场线发展,并由在空间振荡的强垂直电场支持。此外,沿低密度肋和磁场线的方向,在腔和流出等离子体之间形成作为隔离球的双极平行电场结构。

英文摘要:

Particle-in-Cell simulations of collisionless magnetic reconnection with a guide field reveal for the first time the three dimensional features of the low density regions along the magnetic reconnection separatrices, the so-called "cavities". It is found that structures with further lower density develop within the cavities. Because their appearance is similar to the rib shape, these formations are here called "low density ribs". Their location remains approximately fixed in time and their density progressively decreases, as electron currents along the cavities evacuate them. They develop along the magnetic field lines and are supported by a strong perpendicular electric field that oscillates in space. In addition, bipolar parallel electric field structures form as isolated spheres between the cavities and the outflow plasma, along the direction of the low density ribs and of magnetic field lines.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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