Substorms under northward interplanetary magnetic field: Statistical study
文献类型：期刊论文
| 作者 | Z. Peng ; C. Wang ; Y. F. Yang ; H. Li ; Y. Q. Hu ; J. Du |
| 刊名 | Journal of Geophysical Research: Space Physics
 |
| 出版日期 | 2013 |
| 卷号 | 118期号:1页码:364-374 |
| ISSN号 | 2169-9402 |
| 关键词 | substorm northward IMF B_y P_d previous southward IMF |
| 通讯作者 | 北京8701信箱 |
| 中文摘要 | It was recently noted that substorms can occur even under prolonged northward interplanetary magnetic field (IMF) conditions. Based on the substorm list obtained from the IMAGE spacecraft, we perform a statistical study on the features of substorms during northward IMF interval. The strength of the substorm is represented by the AL index decrease and the total intensity of the auroral bulge. Four main features have been found as follows: (1) Most substorms occur soon after a southward IMF, and intense substorms are more likely to occur for short duration of northward IMF period (2 ~ 5 h), whereas no intense substorms occur after prolonged northward IMF condition. (2) There is a positive correlation between the strength of the substorm and the two solar wind parameters (the IMF |By| and the solar wind dynamic pressure Pd). (3) The average strength of the substorms during the storm period is much larger than that of the substorms during the period without storm. Meanwhile, nearly all strong storm time substorms occurred either during the intense storm period, or during the late main phase or the early recovery phase of the storm. (4) About half of substorms, either an increase or a decrease in the solar wind dynamic pressure, are found within 30 min preceding each onset time. Such features indicate that the energy stored in the magnetotail during a previous southward IMF period is the main energy source for substorms under northward IMF condition, especially for intense substorms, and both the IMF |By| and the solar wind dynamic pressure play an important role in the energy accumulation during the northward IMF period |
| 学科主题 | 空间物理 |
| 语种 | 英语 |
| 版本 | 出版稿 |
| 源URL | [http://ir.cssar.ac.cn/handle/122/1526]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Z. Peng,C. Wang,Y. F. Yang,et al. Substorms under northward interplanetary magnetic field: Statistical study[J]. Journal of Geophysical Research: Space Physics,2013,118(1):364-374. |
| APA | Z. Peng,C. Wang,Y. F. Yang,H. Li,Y. Q. Hu,&J. Du.(2013).Substorms under northward interplanetary magnetic field: Statistical study.Journal of Geophysical Research: Space Physics,118(1),364-374. |
| MLA | Z. Peng,et al."Substorms under northward interplanetary magnetic field: Statistical study".Journal of Geophysical Research: Space Physics 118.1(2013):364-374. |
入库方式： OAI收割
来源：国家空间科学中心
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