| 耀斑-激波的南-北非对称性传播 |
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| 引用本文： | 魏奉思,邓晓东.耀斑-激波的南-北非对称性传播[J].地球物理学报,1987,30(5):443-449. |
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| 作者姓名： | 魏奉思 邓晓东 |
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| 作者单位： | 1. 中国科学院空间物理研究所, 北京;
2. 中国科学技术大学, 合肥 |
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| 摘 要： | 本文根据宇宙线Forbush下降幅度随源耀斑纬度分布的新近结果,采用无量纲化的MHD平面斜激波跃变条件,推算得到子午面内一种可能的耀斑-激波模型。发现耀斑-激波在太阳子午面内的传播相对耀斑法线方向是非对称的,激波面后的动力学参数与磁场具有截然相反的非对称性分布;激波传播的最快方向倾向日球电流片方向。该模型可以解释太阳耀斑-地磁、宇宙线效应中的南-北非对称性现象,有助于了解高速等离子体和非均匀背景场之间的相互作用过程。
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| 关 键 词： | 耀斑-激波 行星际激波 耀斑高速流 扰动太阳风 |
| 收稿时间： | 1985-12-26 |
NORTH-SOUTH ASYMMETRIC PROPAGATION OF FLARE-ASSOCIATED INTERPLANETARY SHOCK WAVES |
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| WEI FENG-SI.NORTH-SOUTH ASYMMETRIC PROPAGATION OF FLARE-ASSOCIATED INTERPLANETARY SHOCK WAVES[J].Chinese Journal of Geophysics,1987,30(5):443-449. |
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| Authors: | WEI FENG-SI |
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| Institution: | 1. Institute of Space Physics, Academia Sinica, Beijing;
2. Science and Technology University of China, Hefei |
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| Abstract: | The possible model of flare-associated shock wave propagating in the meridian plane has been deduced from the north-south asymmetry in cosmic ray Forbush decreases, by using the dimensionless jump conditions of MHD. The results show that the propagation of flare-associated shock wave in the meridian plane exhibits a north-south asymmetry relative to the flare normal, and the direction of the fastest propagation velocity tends to the heliospherical current sheet; A region of intensive magnetic field is in the north part of shock wave and weak in the south. On the other hand, a region of higher dynamical parameters （such as velocity, pressure and plasma β parameter, etc.） is in the south part and lower in the north. Transverse expansion towards north-south is also asymmetrical. This physical model is consistent with the results from interplanetary scintillation observations and could explain the north-south asymmetrical effects in the flare-associated geomagnetic disturbances and cosmic ray Forbush decreases. |
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| Keywords: | Flare-shock wave Interplanetary shock wave Flare-high speed streams Disturbance solar wind Heliosphere disturbance |
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