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Simulations of observed auroral brightening caused by solar wind dynamic pressure enhancements under different interplanetary magnetic field conditions
Peng, Z.; Wang, C.; Hu, Y. Q.; Kan, J. R.; Yang, Y. F.; Peng, Z (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space & Appl Res, Beijing 100080, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2011
Volume116Pages:A06217
ISSN0148-0227
Language英语
AbstractSolar 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.; 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.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/3192
Collection空间科学部
Corresponding AuthorPeng, Z (reprint author), Chinese Acad Sci, State Key Lab Space Weather, Ctr Space & Appl Res, Beijing 100080, Peoples R China.
Recommended Citation
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.,&Peng, Z .(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.
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