Effects of guide field on quick magnetic reconnection triggering
Effects of guide field on quick magnetic reconnection triggering
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DOI：
10.1029/2004gl021191
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发表时间：
2004-11
影响因子：
5.2
通讯作者：
K. Tanaka;I. Shinohara;M. Fujimoto
中科院分区：
文献类型：
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作者：
K. Tanaka;I. Shinohara;M. Fujimoto
采用质量比为400的三维全粒子模拟方法研究了导磁场对快速磁重联触发的影响。这里，在恒定导向场B0y=0.75B0x(B0x：重新连接分量的渐近大小)下，执行两次不同电流片厚度(D=0.35和0.5，D：由离子惯性长度归一化的电流片半厚度)。已经在D=0.5∼0.875的零导向场的情况下发现了QMRT，并且QMRT是快速的，因为重新连接的开始直接耦合到系统中最快增长的模式，低混合漂移不稳定性(I.Shinohara和M.Fujimoto，在离子尺度电流片中快速触发磁重连，提交给PhysicalReviewLetters，2004年，下文称为Shinohara和Fujimoto，提交手稿，2004年)。相比之下，当B0y=0.75B0x时，D=0.5太厚，不能进行QMRT。QMRT的恢复出现在D=0.35时，伴随着与LHDI饱和略有延迟的单条X线的形成。
Influence of the guide field on quick magnetic reconnection triggering (QMRT) is investigated by three‐dimensional (3‐D) full‐particle simulations with the mass ratio of 400. Here two runs with different current sheet thickness (D = 0.35 and 0.5, D: the current sheet half thickness normalized by the ion inertial length) are performed with a constant guide field of B0y = 0.75B0x (B0x: asymptotic magnitude of reconnecting component). QMRT has been found in a null guide‐field case of D = 0.5 ∼ 0.875 and is quick because reconnection onset is directly coupled to the most quickly growing mode in the system, the lower‐hybrid drift instability (LHDI) ( I. Shinohara and M. Fujimoto, Quick triggering of magnetic reconnection in an ion‐scale current sheet, submitted to PhysicalReviewLetters, 2004, hereinafter referred to as Shinohara and Fujimoto, submitted manuscript, 2004). In contrast D = 0.5 with B0y = 0.75B0x is too thick to be subject to QMRT. Recovery of QMRT is found at D = 0.35, accompanying a single X‐line formation with slight delay from the LHDI saturation.