Magnetohydrodynamic simulation of the interaction between two interplanetary magnetic clouds and its consequent geoeffectiveness
Magnetohydrodynamic simulation of the interaction between two interplanetary magnetic clouds and its consequent geoeffectiveness
复制标题
两个行星际磁云之间相互作用的磁流体动力学模拟及其随之而来的地球效应
DOI：
10.1029/2007ja012320
复制
发表时间：
2007-11
影响因子：
2.8
通讯作者：
Wu, S. T.
中科院分区：
文献类型：
--
作者：
Zheng, Huinan;Xiong, Ming;Wang, Shui;Wang, Yuming;Wu, S. T.
用2.5维理想磁流体力学(MHD)模型对日球子午面上的行星际“多磁云”进行了数值研究。慢MC1和快MC2最初都是沿着日球层赤道出现的，相继出现的时间间隔不同。两个MC之间的耦合可以看作是两个系统之间的综合相互作用，每个系统都由一个MC主体及其驱动激波组成。MC2驱动的激波和MC2体先后参与了与MC1体的相互作用。动量从MC2转移到MC1。在MC2驱动激波阵面通过后，MC1介质中先前被MC2驱动激波压缩的磁力线不会因MC2推动而恢复。MC1体受前方环境太阳风的压缩作用最强，MC2驱动激波持续穿透MC1体，MC2体在MC1尾部边界处持续推进。随着进化的进行，MC1机体受到越来越大的压缩，其原本脆弱的磁弹性变得越来越坚硬。因此，当累积弹性能平衡外部压缩时，存在多MC的最大可压缩性。就多MC地质有效性而言，演化阶段是主导因素，碰撞强度是次要因素。每个MC的磁弹性、磁螺旋度以及相互之间的压缩是行星际多MC的形成、传播、演化和由此产生的地质有效性的关键物理因素。
Numerical studies of the interplanetary "multiple magnetic clouds (Multi-MC)" are performed by a 2.5-dimensional ideal magnetohydrodynamic (MHD) model in the heliospheric meridional plane. Both slow MC1 and fast MC2 are initially emerged along the heliospheric equator, one after another with different time interval. The coupling of two MCs could be considered as the comprehensive interaction between two systems, each comprising of an MC body and its driven shock. The MC2-driven shock and MC2 body are successively involved into interaction with MC1 body. The momentum is transferred from MC2 to MC1. After the passage of MC2-driven shock front, magnetic field lines in MC1 medium previously compressed by MC2-driven shock are prevented from being restored by the MC2 body pushing. MC1 body undergoes the most violent compression from the ambient solar wind ahead, continuous penetration of MC2-driven shock through MC1 body, and persistent pushing of MC2 body at MC1 tail boundary. As the evolution proceeds, the MC1 body suffers from larger and larger compression, and its original vulnerable magnetic elasticity becomes stiffer and stiffer. So there exists a maximum compressibility of Multi-MC when the accumulated elasticity can balance the external compression. With respect to Multi-MC geoeffectiveness, the evolution stage is a dominant factor, whereas the collision intensity is a subordinate one. The magnetic elasticity, magnetic helicity of each MC, and compression between each other are the key physical factors for the formation, propagation, evolution, and resulting geoeffectiveness of interplanetary Multi-MC.
登录
查看更多内容
DOI：
10.1086/519551
发表时间：
2007-05
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Yao Chen;Yao Chen;You-qiu Hu;S. J. Sun
通讯作者：
Yao Chen;Yao Chen;You-qiu Hu;S. J. Sun
DOI：
--
发表时间：
1988
期刊：
--
影响因子：
--
作者：
F. Wei
通讯作者：
F. Wei
影响因子：
--
作者：
M. Vandas;S. Fischer;M. Dryer;Z. Smith;T. Detman;A. Geranios
通讯作者：
M. Vandas;S. Fischer;M. Dryer;Z. Smith;T. Detman;A. Geranios
DOI：
10.53846/goediss-2624
发表时间：
--
期刊：
--
影响因子：
--
作者：
Xia Lidong
通讯作者：
Xia Lidong
DOI：
10.2514/6.2003-1226
发表时间：
2003-01
期刊：
--
影响因子：
--
作者：
C. Fry;M. Dryer;Wei Sun;C. Deehr;Z. Smith;À. Aran;D. Lario;B. Sanahuja;T. Detman;S. Akasofu
通讯作者：
C. Fry;M. Dryer;Wei Sun;C. Deehr;Z. Smith;À. Aran;D. Lario;B. Sanahuja;T. Detman;S. Akasofu