Solar wind pressure pulse‐driven magnetospheric vortices and their global consequences
Solar wind pressure pulse‐driven magnetospheric vortices and their global consequences
复制标题
DOI：
10.1002/2013ja019551
复制
发表时间：
2014-06
期刊：
影响因子：
--
通讯作者：
Q. Shi;M. Hartinger;V. Angelopoulos;A. Tian;S. Fu;Q. Zong;J. Weygand;J. Raeder;Z. Pu
中科院分区：
文献类型：
--
作者：
Q. Shi;M. Hartinger;V. Angelopoulos;A. Tian;S. Fu;Q. Zong;J. Weygand;J. Raeder;Z. Pu
我们报告了利用亚暴期间事件时间历史和宏观尺度相互作用（THEMIS）卫星的多点测量，对夜侧等离子体片中太阳风动态压力增强引起的等离子体涡旋的现场观测。涡旋的尺度为5-10Re，向下游传播几个Re，在传播的同时不断扩大。涡旋的特征与Sibeck(1990)模型的预测一致，涡旋可以在黎明-黄昏方向深入(~8Re)并耦合场力线振荡。进行了全局磁流体动力学模拟，发现模拟与观测结果一致。来自 THEMIS 地面磁力计站的数据表明电离层中存在向极地传播的涡旋，其旋转方向与磁尾中观察到的涡旋的存在一致。
We report the in situ observation of a plasma vortex induced by a solar wind dynamic pressure enhancement in the nightside plasma sheet using multipoint measurements from Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellites. The vortex has a scale of 5–10 Re and propagates several Re downtail, expanding while propagating. The features of the vortex are consistent with the prediction of the Sibeck (1990) model, and the vortex can penetrate deep (~8 Re) in the dawn‐dusk direction and couple to field line oscillations. Global magnetohydrodynamics simulations are carried out, and it is found that the simulation and observations are consistent with each other. Data from THEMIS ground magnetometer stations indicate a poleward propagating vortex in the ionosphere, with a rotational sense consistent with the existence of the vortex observed in the magnetotail.