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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Localized reconnection in the magnetotail driven by lobe flow channels: Global MHD simulation
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Localized reconnection in the magnetotail driven by lobe flow channels: Global MHD simulation

机译：本地化在磁尾驱动重新连接通过叶流动渠道:全球磁流体动力模拟

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摘要

Recent ionospheric measurements suggest polar cap flow channels often trigger nightside auroral brightening. However, measurements were limited to the ionosphere, and it was not understood if such flow channels can exist in the lobe and can trigger magnetotail reconnection in a localized cross-tail extent. We examined if localized flow channels can form self-consistently in a global MHD regime, and if so, how such flow channels originate and relate to localized magnetotail reconnection. We show that lobe convection became nonuniform with azimuthally narrow flow channels (enhanced dawn-dusk electric fields) of ~3 R_E cross-tail width. The flow channels propagated from the dayside toward the plasma sheet as an interplanetary magnetic field (IMF) discontinuity swept tailward. The plasma sheet around the lobe flow channels became thinner with a similar cross-tail extent and then localized reconnection occurred. These results suggest that localized flow channels can propagate tailward across the lobe and drive localized magnetotail reconnection, that the cross-tail width of reconnection and resulting plasma sheet flow channels and dipolarization fronts are related to the width of inflow from the lobe, and that IMF discontinuities drive lobe flow channels.
机译：最近的电离层测量表明极地冰冠流渠道常常引发阴面极光光明。电离层,如果不理解这种渠道可以存在于叶,可以流动引发局部磁尾重联cross-tail程度。渠道可以形成自我一贯地在全球磁流体动力政权,如果是这样的话,这样的流动通道产生和与局部磁尾重新连接。非均匀与方位狭窄流动通道(~ 3 R_E增强型dawn-dusk电场)cross-tail宽度。从向等离子体片作为的光面行星际磁场(IMF)不连续tailward。流渠道成为薄相似cross-tail程度然后局部重新连接发生。流渠道可以传播tailward穿过叶和驱动局部磁尾重新连接,cross-tail宽度重新连接和产生的等离子体片流渠道和dipolarization方面有关从叶的宽度流入,货币基金组织不连续驱动叶流动通道。

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