Magnetic Energy Release in Flux Pile-up Merging
Magnetic Energy Release in Flux Pile-up Merging
复制标题
磁通堆积合并中的磁能释放
DOI：
10.1023/a:1005258504535
复制
发表时间：
1999
期刊：
影响因子：
--
通讯作者：
I. Craig
中科院分区：
文献类型：
--
作者：
Y. Litvinenko;I. Craig
研究了堆磁重联速率的压力限制问题。我们首先研究了Jardine和Allen（1998）最近提出的建议，即通过考虑非零涡度的流入来缓和流片中磁压力的积累。然而，一个解析论证表明，只有以等离子体中的非物理动态压力为代价，才能避免在小电阻率极限下的无界磁压力。因此，在低β等离子体中，重联速率的压力限制是不能完全避免的。然而，我们证明，在平衡动态压力与等离子体和磁压力的积累的新溶液中，重联可以更快。这种精确的MHD解决方案具有由聚并不稳定性驱动的合并特性。该模型的最大能量释放率能够解释一个适度的太阳耀斑。
The problem of pressure limitations on the rate of flux pile-up magnetic reconnection is studied. We first examine the recent suggestion of Jardine and Allen (1998) for moderating the build-up of magnetic pressure in the current sheet by considering inflows with nonzero vorticity. An analytic argument shows, however, that unbounded magnetic pressures in the limit of small resistivities can be avoided only at the cost of unphysical dynamic pressures in the plasma. Hence, the pressure limitation on the reconnection rate in a low-beta plasma cannot be avoided completely. Nevertheless, we demonstrate that reconnection can be more rapid in a new solution that balances the build-up in dynamic pressure against both the plasma and magnetic pressures. This exact MHD solution has the characteristics of merging driven by the coalescence instability. The maximum energy release rate of the model is capable of explaining a modest solar flare.