Magnetic Nulls in the Reconnection Driven by Turbulence
Magnetic Nulls in the Reconnection Driven by Turbulence
复制标题
湍流驱动的重联中的磁零点
DOI：
10.3847/1538-4357/aa9991
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发表时间：
2017-12
影响因子：
4.9
通讯作者：
Peng F. Z.
中科院分区：
文献类型：
--
作者：
Chen X. H.;Fu H. S.;Liu C. M.;Cao D.;Wang Z.;Dunlop M. W.;Chen Z. Z.;Peng F. Z.
我们首次利用航天器的观测资料研究了磁鞘中湍流驱动的重联事件中的磁零点。我们特别关注磁零拓扑和电流之间的关系，它可以分解为垂直于spine（）和平行于spine（）的分量。我们的新观察包括：结果表明：（1）螺旋形零区的总海流远大于径向零区，（2）螺旋形零区的总海流大，而径向零区的总海流小，（3）径向零区的总海流为主导海流，而螺旋形零区的总海流为主导海流，（4）径向零区和螺旋形零区的扇脊角θ均随θ的增大而减小，且上界清晰;（5）利用715个零值的数据库，统计分析了θ与α的关系，相关系数为cc = 0.71（径向零值）和cc = 0.76（螺旋零值），单位为α。我们对这些观察结果的物理解释是：（1）平行于脊柱的电流显着决定了零拓扑，大的会产生螺旋零值，小的会产生径向零值;（2）垂直于脊柱的电流有助于将扇形平面倾斜到脊柱，无论是螺旋还是径向零值。所有这些观测和结论都大大提高了我们对磁场重联的理解。
For the first time, we use spacecraft measurements to investigate the magnetic nulls in a reconnection event driven by turbulence in the magnetosheath. We particularly focus on the relation between magnetic-null topologies and currents, which can be decomposed into a component perpendicular to spine ( ) and a component parallel to spine ( ). Our new observations include: (1) the total current at spiral nulls is much larger than that at radial nulls; (2) is large at spiral nulls but small at radial nulls; (3) at radial nulls, is dominant, while at spiral nulls, is dominant; (4) the fan-spine angle θ at both radial and spiral nulls decreases with , with a clear upper boundary; (5) with a database of 715 nulls, we statistically resolve the relation between θ and as with the correlation coefficient of cc = 0.71 (radial null) and with cc = 0.76 (spiral null), where is in the unit of . Our physical interpretations of these observations are: (1) the current parallel to spine significantly determines the null topology, with large producing spiral nulls and small producing radial nulls; (2) the current perpendicular to spine serves to tilt the fan plane to the spine, for both spiral and radial nulls. All of these observations and conclusions significantly improve our understanding of magnetic reconnection.
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影响因子：
5.2
作者：
Wenlong Liu;W. Tu;Xinlin Li;T. Sarris;Y. Khotyaintsev;H. Fu;Hui Zhang;Q. Shi
通讯作者：
Wenlong Liu;W. Tu;Xinlin Li;T. Sarris;Y. Khotyaintsev;H. Fu;Hui Zhang;Q. Shi
影响因子：
--
作者：
Wenlong Liu;Xinlin Li;T. Sarris;C. Cully;R. Ergun;V. Angelopoulos;D. Larson;A. Keiling;K. Gla
通讯作者：
Wenlong Liu;Xinlin Li;T. Sarris;C. Cully;R. Ergun;V. Angelopoulos;D. Larson;A. Keiling;K. Gla
影响因子：
--
作者：
M. Dunlop;A. Balogh;K. Glassmeier
通讯作者：
M. Dunlop;A. Balogh;K. Glassmeier
DOI：
10.3847/0004-637x/819/1/52
发表时间：
2015-12
期刊：
The Astrophysical Journal
影响因子：
--
作者：
V. Olshevsky;J. Deca;A. Divin;I. Peng;S. Markidis;M. Innocenti;E. Cazzola;G. Lapenta
通讯作者：
V. Olshevsky;J. Deca;A. Divin;I. Peng;S. Markidis;M. Innocenti;E. Cazzola;G. Lapenta
DOI：
10.1017/cbo9780511525087
发表时间：
2000
期刊：
--
影响因子：
--
作者：
E. Priest;T. Forbes
通讯作者：
E. Priest;T. Forbes