Simulations of observed auroral brightening caused by solar wind dynamic pressure enhancements under different interplanetary magnetic field conditions
文献类型：期刊论文
| 作者 | Peng, Z.; Wang, C.; Hu, Y. Q.; Kan, J. R.; Yang, Y. F. |
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2011 |
| 卷号 | 116页码:A06217 |
| ISSN号 | 0148-0227 |
| 通讯作者 | Peng, Z (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space & Appl Res, Beijing 100080, Peoples R China. |
| 中文摘要 | Solar wind dynamic pressure (P(dyn)) enhancements have been observed to cause large-scale auroral brightening. The mechanism for this kind of auroral brightening is still a topic of current space research. Using the global piecewise parabolic method Lagrangian remap (PPMLR)-MHD simulation model, we investigate three auroral brightening events caused by dynamic pressure enhancement under different interplanetary magnetic field (IMF) conditions: (1) B(z) < 0 and B(y) > 0 on 11 August 2000, (2) B(z) < 0 and B(y) < 0 on 8 May 2001, and (3) B(z) >= 0 on 21 January 2005. We show that the auroral location depends on the IMF conditions. Under southward IMF conditions, when B(y) is negative, the duskside aurora is located more equatorward at around 70 degrees magnetic latitude (MLAT) for all magnetic local times; when B(y) is positive, the duskside aurora can even reach beyond 80 degrees MLAT. A smaller and more localized response is seen when the IMF B(z) is nearly zero or northward, as shown in previous studies. Our simulation results are consistent with these observations, indicating that the observed aurora activities could be caused by solar wind dynamic pressure enhancements. The simulation results suggest that the enhancement of P(dyn) can increase the ionospheric transpolar potential and the corresponding field-aligned currents, leading to the observed auroral brightening. |
| 英文摘要 | Solar wind dynamic pressure (P(dyn)) enhancements have been observed to cause large-scale auroral brightening. The mechanism for this kind of auroral brightening is still a topic of current space research. Using the global piecewise parabolic method Lagrangian remap (PPMLR)-MHD simulation model, we investigate three auroral brightening events caused by dynamic pressure enhancement under different interplanetary magnetic field (IMF) conditions: (1) B(z) < 0 and B(y) > 0 on 11 August 2000, (2) B(z) < 0 and B(y) < 0 on 8 May 2001, and (3) B(z) >= 0 on 21 January 2005. We show that the auroral location depends on the IMF conditions. Under southward IMF conditions, when B(y) is negative, the duskside aurora is located more equatorward at around 70 degrees magnetic latitude (MLAT) for all magnetic local times; when B(y) is positive, the duskside aurora can even reach beyond 80 degrees MLAT. A smaller and more localized response is seen when the IMF B(z) is nearly zero or northward, as shown in previous studies. Our simulation results are consistent with these observations, indicating that the observed aurora activities could be caused by solar wind dynamic pressure enhancements. The simulation results suggest that the enhancement of P(dyn) can increase the ionospheric transpolar potential and the corresponding field-aligned currents, leading to the observed auroral brightening. |
| 学科主题 | 空间物理 |
| 资助信息 | Specialized Research Fund for State Key Laboratories of China; Specialized Research Fund for Shandong Provincial Key Laboratory; [NNSFC 40921063]; [40831060]; [41004073] |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2014-12-15 |
| 源URL | [http://ir.nssc.ac.cn/handle/122/3192]  |
| 专题 | 国家空间科学中心_空间科学部 |
| 推荐引用方式 GB/T 7714 | Peng, Z.,Wang, C.,Hu, Y. Q.,et al. Simulations of observed auroral brightening caused by solar wind dynamic pressure enhancements under different interplanetary magnetic field conditions[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2011,116:A06217. |
| APA | Peng, Z.,Wang, C.,Hu, Y. Q.,Kan, J. R.,&Yang, Y. F..(2011).Simulations of observed auroral brightening caused by solar wind dynamic pressure enhancements under different interplanetary magnetic field conditions.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,116,A06217. |
| MLA | Peng, Z.,et al."Simulations of observed auroral brightening caused by solar wind dynamic pressure enhancements under different interplanetary magnetic field conditions".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 116(2011):A06217. |
入库方式： OAI收割
来源：国家空间科学中心
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