极端太阳风条件下的磁层顶位形
Magnetopause Location and Shape Under Extreme Solar Wind Conditions
查看参考文献14篇
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文摘
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基于极端太阳风条件下的三维MHD数值模拟数据,构建了一种极端太阳风条件下的三维非对称磁层顶位形模型.所提出的模型考虑了行星际南向磁场(IMF)B_z日下点距离侵蚀的饱和效应,太阳风动压Pd对磁层顶张角影响的饱和效应,赤道面、昼夜子午面磁层顶的不对称性以及极尖区的内凹结构和内凹中心的移动,并利用Levenberg-Marquart多参量非线性拟合方法拟合了模型参数.数值模拟研究表明,在极端太阳风条件下,随Pd增大,磁层顶日下点距离减小,磁层顶磁尾张角几乎不变;随南向(IMF)B_z增大,磁层顶日下点距离略有减小,磁层顶磁尾张角减小,极尖区内凹中心向低纬移动.通过对2010年8月1日太阳风暴事件验证发现,本文所建立的模型能够描述极端太阳风条件下的三维磁层顶位形. |
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其他语种文摘
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Based on the 3D global MHD numerical simulation data under extreme solar wind conditions,a dynamic 3D asymmetric magnetopause model under extreme solar wind conditions is developed.This magnetopause model parameters are fitted by the Levenberg-Marquart method and this magnetopause model has the ability to describe the saturation effects of the solar wind dynamic pressure P_d on the flaring of the magnetopause,the saturation effects of the interplanetary magnetic field(IMF) B_z on the subsolar standoff distance,the magnetopause indentation in the cusp region, the magnetopause asymmetry and the movement of magnetopause indentation center.On the basis of this model under extreme solar wind conditions,the subsolar point decreases with increasing P_d and increasing P_d causes the decrease of the magnetopause size but almost keeps the magnetopause shapes self-similar;with increasing southward(IMF) B_z,the subsolar point decreases slightly,the flaring of the magnetopause decreases and magnetopause indentation center moves towards lowlatitude. Through analysis of the solar storm on August 1,2010,it is found that this magnetopause model can describe the global magnetopause location and shape under extreme solar wind conditions. |
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来源
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空间科学学报
,2012,32(2):161-169 【核心库】
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关键词
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磁层顶模型
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数值模拟
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极端太阳风条件
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地址
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中国科学院空间科学与应用研究中心, 空间天气学国家重点实验室, 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0254-6124 |
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学科
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地球物理学 |
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基金
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国家自然科学基金项目
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空间天气学国家重点实验室科研专项基金共同资助
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文献收藏号
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CSCD:4504066
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参考文献 共
14
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