MESSENGER Observations ofMercury's Nightside Magnetosphere Under Extreme Solar Wind Conditions: Reconnection-Generated Structures and Steady Convection

W. J. Sun; J. A. Slavin; R. M. DeweyY. ChenG. A. DiBraccioJ.M. RainesJ. M. JasinskiX. JiaM. Akhavan-Tafti

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MESSENGER Observations ofMercury's Nightside Magnetosphere Under Extreme Solar Wind Conditions: Reconnection-Generated Structures and Steady Convection

机译：信使观察ofMercury阴面磁气圈下极端的太阳风条件:Reconnection-Generated结构和稳定的对流

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Mercury's nightside magnetosphere is investigated under the impact of a coronal mass ejection (CME) and a high-speed stream (HSS) with MErcury Surface, Space ENviroment, GEochemistry, and Ranging (MESSENGER) observations. The CME was shown to produce a low plasma β (ratio of thermal pressure to magnetic pressure) magnetosheath, while the HSS creates a higher β magnetosheath. Reconnection at the dayside magnetopause was found to be stronger during the CME than the HSS, but both were stronger than the average condition (Slavin et al., 2014, https://doi.org/10.1002/2014JA020319). Here we show that the CME and HSS events produced large numbers of flux ropes and dipolarization fronts in the plasma sheet. The occurrence rates for the structures were approximately 2 orders of magnitude higher than under average conditions with the rates during CME's being twice that of HSS's. The flux ropes appeared as quasiperiodic flux rope groups. Each group lasted approximately 1 min and had a few large flux ropes followed by several smaller flux ropes. The lobe magnetic flux accounted for around half of the Mercury's available magnetic flux with the flux during CME's being larger than that of HSS's. The CME produced a more dynamic nightside magnetosphere than the HSS. Further, for the CME event, the tail magnetic reconnection produced a distorted Hall magnetic field pattern and the X-line had a dawn-dusk extent of 20% of the tail width. No magnetic flux loading and unloading events were observed suggesting that, during these intense driving conditions, Mercury's magnetosphere responded with a type of quasi-steady convection as opposed to the tail flux loading-unloading events seen at Earth.

机译：水星的阴面磁气圈在日冕物质抛射(CME)的影响和高速流(HSS)汞表面上看,空间环境,地球化学,排列(MESSENGER)观察。可以产生一个低血浆β(热的比例压磁压力)磁鞘,虽然高速钢创建一个高β磁鞘。重新连接的光面的磁层发现强比高速钢在芝加哥商品交易所,但都比平均的状态https://doi.org/10.1002/2014JA020319)。表明,芝加哥商品交易所和高速钢生产大事件数量的通量绳索和dipolarization方面在等离子体片。结构大约2订单级高于平均水平的条件下利率在芝加哥商品交易所的的两倍高速钢。通量绳组。1分钟,几大通量绳紧随其后几家规模较小的通量绳。通量占大约一半的水星可用磁通与通量芝加哥商品交易所是比高速钢。产生一个更动态的阴面磁气圈比高速钢。磁场重联的尾巴产生了扭曲大厅磁场模式和x轴dawn-dusk程度尾宽度的20%。磁通装卸活动观察表明,在这些激烈驾驶条件下,水星的磁场了一种准稳定的对流而不是尾巴通量装卸事件在地球上看到。

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来源
《Journal of Geophysical Research, A. Space Physics: JGR》 |2020年第3期|e2019JA027490-1-e2019JA027490-27|共27页
作者
W. J. Sun; J. A. Slavin; R. M. DeweyY. ChenG. A. DiBraccioJ.M. RainesJ. M. JasinskiX. JiaM. Akhavan-Tafti;
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作者单位

Department of Climate and Space Sciences and Engineering, University of Michigan, Ann Arbor, MI, USA;

NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA;

Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD, USA;

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正文语种英语
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coronal mass ejection; solar wind; Average Conditions;

机译：日冕物质抛射,太阳风;平均水平条件;

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MESSENGER Observations ofMercury's Nightside Magnetosphere Under Extreme Solar Wind Conditions: Reconnection-Generated Structures and Steady Convection

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