On the electron agyrotropy during rapid asymmetric magnetic island coalescence in presence of a guide field
On the electron agyrotropy during rapid asymmetric magnetic island coalescence in presence of a guide field
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DOI：
10.1002/2016gl070195
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发表时间：
2016-08
影响因子：
5.2
通讯作者：
E. Cazzola;M. Innocenti;M. Goldman;D. Newman;S. Markidis;G. Lapenta
中科院分区：
文献类型：
--
作者：
E. Cazzola;M. Innocenti;M. Goldman;D. Newman;S. Markidis;G. Lapenta
本文分析了在有无引导场的非对称重联中，电子在岛合并过程中的速度分布特性。在以前的研究中，确定了三个主要领域，在没有引导场的情况下，作为X，D和M区域具有不同的重连演变。这些区域在这里也在具有引导场的情况下被标识。我们研究了偏离各向同性和gyrotropic行为通过不同的鲁棒检测算法在文献中提出的。虽然在没有引导场的情况下，这些指标显示出总体一致，但当存在引导场时，观察到一些相关区域内（例如分界线和磁岛内部）的无自转差异。此外，根据多尺度磁球使命的新观测，分析了这些域中的电子速度相空间。
We present an analysis of the properties of the electron velocity distribution during island coalescence in asymmetric reconnection with and without guide field. In a previous study, three main domains were identified, in the case without guide field, as X, D, and M regions featuring different reconnection evolutions. These regions are also identified here in the case with guide field. We study the departure from isotropic and gyrotropic behavior by means of different robust detection algorithms proposed in the literature. While in the case without guide field these metrics show an overall agreement, when the guide field is present, a discrepancy in the agyrotropy within some relevant regions is observed, such as at the separatrices and inside magnetic islands. Moreover, in light of the new observations from the Multiscale MagnetoSpheric mission, an analysis of the electron velocity phase‐space in these domains is presented.