On the role of system size in Hall MHD magnetic reconnection

被引：6

作者：

Bard, C. ^{[1
]}

Dorelli, J. C. ^{[2
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Postdoctoral Program, Greenbelt, MD 20771 USA

[2] NASA, Goddard Space Flight Ctr, Code 673, Greenbelt, MD 20771 USA

来源：

PHYSICS OF PLASMAS | 2018年 / 25卷 / 02期

关键词：

CURRENT SHEETS; COLLISIONLESS; COALESCENCE; SCHEMES; GODUNOV; SOLAR;

D O I：

10.1063/1.5010785

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

We study the effects of the Hall electric field on magnetic island coalescence in the large island limit and find evidence for both an elongated electron current sheet layer with a Sweet-Parker-like reconnection rate and a collapsed, Petschek-like electron sheet with a peak reconnection rate approaching the 0.1v(A)B(0) Hall MHD rate. The state observed in our simulations appears to depend on the grid scale. Furthermore, even at the largest system sizes, we find that flux-pileup effects cause the islands to "bounce" despite the presence of a collapsed current sheet allowing fast instantaneous reconnection. The average reconnection rate in the large island limit is slow though the peak reconnection rate is fast.

引用

页数：6

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