Driven reconnection in a quadrupole cusp field
Driven reconnection in a quadrupole cusp field
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DOI：
10.1063/1.2032647
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发表时间：
2005-08
影响因子：
2.2
通讯作者：
A. Aydemir
中科院分区：
文献类型：
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作者：
A. Aydemir
在不同的碰撞机制下，数值研究了四极会切场中的驱动磁场重联。准稳态重联率远远超过经常引用的限制进行观察。正如预期的那样，速率是由外部边界条件决定的，并且似乎只受计算问题的限制;因此，在这种配置中，慢重联仅通过重联层几何形状的变化来区分。碰撞重联表现出典型的Sweet-Parker模型的扩展电流层，而由动力学Alven或哨声波介导的无碰撞重联具有Petschek型“X层”构型。在X点的电流密度减少碰撞的情况下，在定性协议的结果从多功能环形实验。
Driven magnetic reconnection in a quadrupole cusp field is examined numerically in various collisionality regimes. Quasi-steady-state reconnection rates far in excess of often-quoted limits are observed. As expected, the rate is determined by external boundary conditions and appears to be limited only by computational concerns; thus, in this configuration the slow reconnection is differentiated from the fast one only by changes in the reconnection-layer geometry. Collisional reconnection exhibits the typical extended current layer of the Sweet-Parker model, whereas the collisionless reconnection mediated by kinetic-Alven or whistler waves has the Petschek-type “X-layer” configuration. The current density at the X point is reduced in the collisionless cases, in qualitative agreement with the results from the Versatile Toroidal Facility experiment.