| 行星际速度增幅扰动的演化 |
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| 引用本文： | 胡友秋,刘宝军.行星际速度增幅扰动的演化[J].地球物理学报,2003,46(3):289-294. |
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| 作者姓名： | 胡友秋 刘宝军 |
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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 ( 499740 35 )，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： | 采用二维理想MHD模型，分别在日球赤道面（二维二分量模型）和日球子午面（二维 三分量模型）内研究太阳风中纯速度增幅扰动的演化. 结果表明，该扰动在向外传播的过程 中逐渐演化为双重激波对，即由4个激波组成的激波系统. 该4个激波按离太阳由近及远依次 为后向快激波、后向慢激波、前向慢激波和前向快激波. 双重激波对在子午面内相对扰动源 中心法线基本对称，而在赤道面内则不对称：扰动源中心法线西侧双重激波对结构更为明显 ，所跨经度范围宽于东侧. 初步分析表明，行星际磁场的螺旋结构是产生日球赤道面内双重 激波对结构东西不对称性的主要原因.
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| 关 键 词： | 日球动力学 双重激波对 MHD数值模拟 |
| 文章编号： | 0001-5733(2003)03-0289-06 |
| 收稿时间： | 2002-7-1 |
| 修稿时间： | 2003-1-20 |
EVOLUTION OF INTERPLANETARY FLOW VELOCITY ENHANCEMENT DISTURBANCE |
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| HU YOUQIU.EVOLUTION OF INTERPLANETARY FLOW VELOCITY ENHANCEMENT DISTURBANCE[J].Chinese Journal of Geophysics,2003,46(3):289-294. |
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| Authors: | HU YOUQIU |
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| Institution: | School of Earth and Space Science, University of Science and Technology of China , Hefei 230026, China |
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| Abstract: | Using an ideal two-dimensional MHD model, this paper investigates the evolution of a pure flow velocity enhancement disturbance in the solar wind in the heliospheric equatorial plane (2-D, 2-component model) and the heliospheric meridional plane (2-D, 3-component model). It is shown that the disturbance evolves into a double shock pair, i.e., a shock system that consists of four shocks: a reverse fast shock, a reverse slow shock, a forward slow shock, and a forward fast shock from the close to the distant with respect to the Sun. The double shock pair is nearly symmetrical with respect to the central normal of the disturbance source in the heliospheric meridional plane, whereas it is asymmetrical in the heliospheric equatorial plane. On the western side of the central normal of the disturbance source in the heliospheric equatorial plane, the double shock pair structure is more evident, and the longitudinal span is wider than those on the eastern side. A preliminary analysis shows that the east-west asymmetry in the heliospheric equatorial plane is mainly attributed to the spiral structure of the interplanetary magnetic field. |
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| Keywords: | Heliospheric dynamics Double shock pair MHD simulation |
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