Numerical simulation of magnetospheric ULF waves excited by positive and   negative impulses of solar wind dynamic pressure

doi:10.1007/s11431-009-0270-6

CORC > 北京大学 > 地球与空间科学学院

	Numerical simulation of magnetospheric ULF waves excited by positive and negative impulses of solar wind dynamic pressure
	Zhang XiangYun ; Zong QiuGang ; Yang Biao ; Wang YongFu
刊名	中国科学e辑技术科学
	2009
关键词	positive and negative impulses of solar wind dynamic pressure ULF waves field line resonances (FLRs) DIPOLE MODEL FAST SHOCKS EXCITATION DISTURBANCES BOUNDARY REGIONS AURORA
DOI	10.1007/s11431-009-0270-6
英文摘要	The sources of ultra low frequency (ULF) waves in the magnetosphere are generally believed to be either the external solar wind perturbations or the internal plasma instabilities. When a sudden impulse of the solar wind dynamic pressure impinges on the magnetopause, ULF waves might be excited and thus the solar wind energy is transported into the earth's magnetosphere. In this paper, we study the ULF waves excited by different kinds of sudden solar wind pressure impulses through an MHD simulation. We primarily focus on the responses of the earth's magnetosphere to positive/negative impulses of solar wind dynamic pressure, and positive-negative impulse pairs. The simulation results show that the ULF waves excited by positive and negative impulse have the same amplitude and frequency, with 180A degrees difference in phase, if the amplitude and durations of the input impulses are the same. In addition, it is found that field line resonances (FLRs) occur at certain L-shell regions of the earth's magnetosphere after the impact of different positive-negative impulse pairs, which appear to be related to the duration of the impulses and the time interval between the sequential impulses. Another result is that the energy from the solar wind could be transported deeper into the inner magnetosphere by an impulse pair than by a single pulse impact. The results presented in this paper could help us to better understand how energy is transported from solar wind to the earth's magnetosphere via ULF waves. Also, these results provide some new clues to understanding of how energetic particles in the inner magnetosphere response to different kinds of solar wind pressure impulse impacts including interplanetary shocks.; Engineering, Multidisciplinary; Materials Science, Multidisciplinary; SCI(E); EI; 4; ARTICLE; 10; 2886-2894; 52
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/148849]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhang XiangYun,Zong QiuGang,Yang Biao,et al. Numerical simulation of magnetospheric ULF waves excited by positive and negative impulses of solar wind dynamic pressure[J]. 中国科学e辑技术科学,2009.
APA	Zhang XiangYun,Zong QiuGang,Yang Biao,&Wang YongFu.(2009).Numerical simulation of magnetospheric ULF waves excited by positive and negative impulses of solar wind dynamic pressure.中国科学e辑技术科学.
MLA	Zhang XiangYun,et al."Numerical simulation of magnetospheric ULF waves excited by positive and negative impulses of solar wind dynamic pressure".中国科学e辑技术科学 (2009).