Global Empirical Picture of Magnetospheric Substorms Inferred From Multimission Magnetometer Data

Global Empirical Picture of Magnetospheric Substorms Inferred From Multimission Magnetometer Data
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从多任务磁力计数据推断的磁层亚暴的全球经验图

DOI:
10.1029/2018ja025843
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发表时间:
2019
期刊:
Journal of Geophysical Research: Space Physics
影响因子:
--
通讯作者:
Ukhorskiy, A. Y.
Ukhorskiy, A. Y.
中科院分区:
--
文献类型:
--
作者:
Stephens, G. K.;Sitnov, M. I.;Korth, H.;Tsyganenko, N. A.;Ohtani, S.;Gkioulidou, M.;Ukhorskiy, A. Y.

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磁层亚暴是地球磁层与太阳风相互作用中的关键爆炸过程,对其的理解和建模对于空间天气预报至关重要。在亚暴期间,夜面的磁场首先向反太阳方向伸展,然后迅速向地球收缩,将遥远空间区域的热等离子体带入内磁层,在那里它们有助于地磁风暴和极区电离层的焦耳耗散,造成令人印象深刻的极光飞溅。在这里,我们首次展示了从多个任务中挖掘数百万个星载磁强计数据记录,使人们能够重建这些拉伸和偶极过程的全球3D图像。拉伸导致形成薄(小于地球半径)和强电流片,在偶极过程中被转移到电离层。与此同时,双极化信号进一步传播到内磁层,导致在那里积累更长时间的电流,从而产生原地磁暴。根据数据重建了相应亚暴流的全球三维结构,包括亚暴流楔。
Magnetospheric substorms represent key explosive processes in the interaction of the Earth's magnetosphere with the solar wind, and their understanding and modeling are critical for space weather forecasting. During substorms, the magnetic field on the nightside is first stretched in the antisunward direction and then it rapidly contracts earthward bringing hot plasmas from the distant space regions into the inner magnetosphere, where they contribute to geomagnetic storms and Joule dissipation in the polar ionosphere, causing impressive splashes of aurora. Here we show for the first time that mining millions of spaceborne magnetometer data records from multiple missions allows one to reconstruct the global 3‐D picture of these stretching and dipolarization processes. Stretching results in the formation of a thin (less than the Earth's radius) and strong current sheet, which is diverted into the ionosphere during dipolarization. In the meantime, the dipolarization signal propagates further into the inner magnetosphere resulting in the accumulation of a longer lived current there, giving rise to a protogeomagnetic storm. The global 3‐D structure of the corresponding substorm currents including the substorm current wedge is reconstructed from data.
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影响因子: 2.4
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极端事件的经验模拟:风暴时期的地磁场、电流和压力分布
DOI: 10.1016/b978-0-12-812700-1.00011-x
发表时间: 2018
影响因子: 10.3
作者:
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