Evidence for a flux transfer event generated by multiple X‐line reconnection at the magnetopause
Evidence for a flux transfer event generated by multiple X‐line reconnection at the magnetopause
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DOI：
10.1029/2010gl044219
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发表时间：
2010-08
影响因子：
5.2
通讯作者：
H. Hasegawa;J. Wang;M. Dunlop;Zuyin Pu;Qinghe Zhang;B. Lavraud;Matthew Taylor;O. D. Constantinescu;J. Berchem;V. Angelopoulos;J. Mcfadden;Harald U. Frey;E. Panov;M. Volwerk;Y. Bogdanova
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文献类型：
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作者：
H. Hasegawa;J. Wang;M. Dunlop;Zuyin Pu;Qinghe Zhang;B. Lavraud;Matthew Taylor;O. D. Constantinescu;J. Berchem;V. Angelopoulos;J. Mcfadden;Harald U. Frey;E. Panov;M. Volwerk;Y. Bogdanova
磁通量传输事件（FTE）是不稳定磁场重联的特征，经常在行星磁层顶观测到。它们的产生机制是决定它们如何调节太阳风能量转移到磁层的关键因素，但在很大程度上仍然未知。我们报告了THEMIS航天器在2007 - 06 - 14年对向阳面磁层顶多次X线重联产生的FTE的观测。证据包括：（1）两个方向相反的离子喷流朝缓慢向南移动的FTE会聚;（2）FTE核心的横截面沿磁层顶法线沿着伸长，可能被方向相反的喷流挤压;（3）磁鞘中高能电子的双向场对准通量，表明FTE两侧的重连。的意见同意与全球磁流体动力学模型的FTE代下的大地磁偶极子倾斜，这意味着磁通量运输到磁尾的效率较低的更大的偶极子倾斜。
Magnetic flux transfer events (FTEs) are signatures of unsteady magnetic reconnection, often observed at planetary magnetopauses. Their generation mechanism, a key ingredient determining how they regulate the transfer of solar wind energy into magnetospheres, is still largely unknown. We report THEMIS spacecraft observations on 2007‐06‐14 of an FTE generated by multiple X‐line reconnection at the dayside magnetopause. The evidence consists of (1) two oppositely‐directed ion jets converging toward the FTE that was slowly moving southward, (2) the cross‐section of the FTE core being elongated along the magnetopause normal, probably squeezed by the oppositely‐directed jets, and (3) bidirectional field‐aligned fluxes of energetic electrons in the magnetosheath, indicating reconnection on both sides of the FTE. The observations agree well with a global magnetohydrodynamic model of the FTE generation under large geomagnetic dipole tilt, which implies the efficiency of magnetic flux transport into the magnetotail being lower for larger dipole tilt.