| 磁暴主相多阶发展行星际起因的初步分析 |
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| 引用本文： | 佟亚男,刘四清,张效信,林瑞淋,龚建村.磁暴主相多阶发展行星际起因的初步分析[J].地球物理学报,2011,54(6):1439-1456. |
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| 作者姓名： | 佟亚男 刘四清 张效信 林瑞淋 龚建村 |
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| 作者单位： | 1. 中国科学院空间科学与应用研究中心,北京 100190;
2. 中国科学院研究生院,北京 100049;
3. 中国气象局国家空间天气监测预警中心,北京 100081 |
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| 摘 要： | 本文利用1998～2006年与磁云有关的80起中强磁暴(Dst*≤-50 nT),对其主相期间不同发展阶数磁暴的行星际起因进行了统计分析.重点研究了鞘区磁场单独作用、磁云本体单独作用、鞘区与磁云共同作用以及其他复杂行星际结构在磁暴主相多阶发展中的相对重要性,并对导致磁暴主相增加一阶的行星际起因做了初步分析.统计结果表明...
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| 关 键 词： | 多阶磁暴 Dst指数 磁云 行星际磁场南向分量 行星际电场 |
| 收稿时间： | 2010-05-19 |
Primary analysis on the interplanetary cause of multistep magnetic storms |
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| TONG Ya-Nan,LIU Si-Qing,ZHANG Xiao-Xin,LIN Rui-Lin,GONG Jian-Cun.Primary analysis on the interplanetary cause of multistep magnetic storms[J].Chinese Journal of Geophysics,2011,54(6):1439-1456. |
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| Authors: | TONG Ya-Nan LIU Si-Qing ZHANG Xiao-Xin LIN Rui-Lin GONG Jian-Cun |
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| Institution: | 1. The Center for Space Science and Applied Research, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China;
3. China Meteorological Administration and National Center for Space Weather Monitoring and Warning, Beijing 100081, China |
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| Abstract: | Using eighty moderate intense geomagnetic storms (Dst*≤-50 nT) induced by MCs from 1998 to 2006, we statistically examined the relations between the geomagnetic storms development in different steps during the main phases and their interplanetary sources. This paper has analyzed the relative importance of sheath region magnetic field ahead of MC、MC itself、the combination of sheath and MC, and other complicated interplanetary structures in the associated multistep storms, and the interplanetary drivers leading to Dst* index further decrease were also investigagetd. It is found that: (1) above 1/2 moderate intense storms have a two-step or more than two steps development during their main phases (called multiple-step storms), and the percentages of one-step storms and multistep storms in the moderate storms (-100 nT*≤-50 nT) are 53.8% and 46.2%, and in intense storms(Dst*≤-100 nT) the percentages are 42.6% and 57.4% respectively; (2) with the step number increases, the average duration of main phase is also prolonged; (3) sheath field itself, MC itself, the combination of sheath and MC, and other complicated interplanetary structures all can lead to multistep storms; (4) 46.5% of multistep storms were induced by the combinations of sheath and MC fields, 34.9% of multistep storms were induced by sheath field itself or MC itself, and the others were induced by the complicated interplanetary structures. (5) in the magnetic storms induced by the sheath region, the magnetic structures of sheath field were closely related to the development of the main phases; (6) the multistep storms have close relation to the intermittent development of the interplanetary southward component of magnetic field (Bz) and y component of electric field (Ey), and the prediction relationships for every step Dstmin* and the Eymax/Bzmin during the step are: Dstmin* =-34.62-11.89×Eymax and Dstmin* =-5.90+8.50×Bzmin. |
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| Keywords: | Multiple step storm Dst index Magnetic cloud Interplanetary south magnetic field Interplanetary electric field |
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