Observation of a retreating x line and magnetic islands poleward of the cusp during northward interplanetary magnetic field conditions

被引:16
|
作者
Wilder, F. D. [1 ]
Eriksson, S. [1 ]
Trattner, K. J. [1 ]
Cassak, P. A. [2 ]
Fuselier, S. A. [3 ,4 ]
Lybekk, B. [5 ]
机构
[1] Univ Colorado, Atmospher & Space Phys Lab, Boulder, CO 80309 USA
[2] W Virginia Univ, Dept Phys & Astron, Morgantown, WV 26506 USA
[3] SW Res Inst, San Antonio, TX USA
[4] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX USA
[5] Univ Oslo, Dept Phys, Oslo, Norway
基金
美国国家科学基金会;
关键词
EARTHS MAGNETOSPHERE; CLUSTER OBSERVATIONS; MAGNETOPAUSE; RECONNECTION; CONVECTION; PLASMA; IMF;
D O I
10.1002/2014JA020453
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
When the interplanetary magnetic field is northward, reconnection occurs in each hemisphere on lobe field lines, poleward of the cusp. We have identified a case where the Cluster spacecraft crossed the magnetopause and encountered a tailward retreating x line. The x line is identified by the encounter of both a tailward and sunward jet, as well as Hall magnetic field signatures in the out-of-plane direction. Additionally, we find no signatures of electron heating and hypothesize that the spacecraft is too close to the x line to observe the accelerated electrons. Using two spacecraft, we are able to resolve the velocity of the structure, which moves near the magnetosheath speed. The speed of the x line is also consistent with the asymmetric reconnection theory. To our knowledge, this is the first time the speed of a retreating x line has been measured directly. Additionally, we observe ion distribution functions with counterstreaming populations, suggesting that a second x line formed sunward of the original one, leading to a magnetic island.
引用
收藏
页码:9643 / 9657
页数:15
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