| 内日球子午面瞬态激波的传播特性 |
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| 引用本文： | 贾先哲, 胡友秋. 内日球子午面瞬态激波的传播特性[J]. 地球物理学报, 2004, 47(1): 1-5, |
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| 作者姓名： | 贾先哲 胡友秋 |
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| 作者单位： | 中国科学技术大学地球与空间科学学院,合肥 230026 |
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| 基金项目： | 国家自然科学基金项目 (4 99740 3 5 )，中国科学技术大学创新工程研究基金资助项目 |
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| 摘 要： | 采用日球子午面内的二维三分量MHD模型，研究瞬态激波的传播特性，着重分析日球 电流片（HCS）、日球等离子体片（HPS）和低速流结构对激波传播的影响．结果表明，HCS 和HPS对激波传播几乎没有影响，而跨越HCS和HPS的低速流则显著改变激波的传播特性. 低 速流对激波的反射，导致激波扰动源一侧的激波速度加快、强度增强，低速流对激波透射的 阻碍作用导致激波扰动源异侧的激波滞后、强度减弱，但激波阵面的纬度跨度有所加宽．在 激波穿越过后，低速流区朝激波传播方向弯曲并受到骚扰，使得激波下游出现复杂的扰动结 构；对于激波扰动源同侧的激波下游，反射波与该处等离子体的相互作用同样会导致较为复 杂的扰动出现.
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| 关 键 词： | 日球动力学 低速流 MHD激波 |
| 文章编号： | 0001-5733(2004)01-0001-05 |
| 收稿时间： | 2002-12-29 |
| 修稿时间： | 2002-12-29 |
Propagation properties of transient shocks in the inner heliospheric meridional plane |
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| JIA Xian-Zhe, HU You-Qiu. Propagation properties of transient shocks in the inner heliospheric meridional plane[J]. Chinese Journal of Geophysics (in Chinese), 2004, 47(1): 1-5, |
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| Authors: | JIA Xian-Zhe HU You-Qiu |
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| Affiliation: | School of Earth and Space Science, University of Science and Technol ogy of China, Hefei 230026, China |
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| Abstract: | Using a two dimensional three component MHD model in the heliospheric meridional plane, this paper investigates the propagation properties of transient shocks with emphasis on the influence of the heliospheric current sheet (HCS), the heliospheric plasma sheet (HPS) and the low speed stream on the shock propagation. The results show that the HCS and HPS have little effect on the shock propagation, whereas the low speed stream remarkably changes the shock propagation properties. The reflection of a shock against the low speed stream leads to a speed up and strengthening of the shock situated at the same side as the shock disturbance source. On the other hand, the resistance of the low speed stream against the shock transmission results in a delay and weakening of the shock situated at the opposite side to the shock disturbance source, but the shock front is widened in latitude. After the shock transmission, the low speed stream region is bent toward the shock propagation direction and disturbed, leading to complex fluctuations in the downstream of the shock. In the downstream of the shock on the same side to the shock disturbance source, the reflected wave interacts with the plasma there, and thus leads to the occurrence of complex fluctuations as well. |
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| Keywords: | Heliospheric dynamics Interplanetary electric current sheet MHD shock |
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