THEMIS observations of ULF wave excitation in the nightside plasma sheet   during sudden impulse events

doi:10.1029/2012JA017984

CORC > 北京大学 > 地球与空间科学学院

	THEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events
	Shi, Q. Q. ; Hartinger, M. ; Angelopoulos, V. ; Zong, Q.G. ; Zhou, X.Z. ; Zhou, X.Y. ; Kellerman, A. ; Tian, A. M. ; Weygand, J. ; Fu, S. Y. ; Pu, Z. Y. ; Raeder, J. ; Ge, Y. S. ; Wang, Y. F. ; Zhang, H. ; Yao, Z. H.
刊名	journal of geophysical research space physics
	2013
关键词	FIELD LINE RESONANCES SOLAR-WIND PRESSURE HYDROMAGNETIC-WAVES MAGNETIC PULSATIONS MAGNETOSPHERIC CAVITY INTERPLANETARY SHOCKS EARTHS MAGNETOSPHERE CLUSTER OBSERVATIONS ALFVEN WAVES JULY 29
DOI	10.1029/2012JA017984
英文摘要	Sudden impulses (SIs) are an important source of ultra low frequency (ULF) wave activity throughout the Earth's magnetosphere. Most SI-induced ULF wave events have been reported in the dayside magnetosphere; it is not clear when and how SIs drive ULF wave activity in the nightside plasma sheet. We examined the ULF response of the nightside plasma sheet to SIs using an ensemble of 13 SI events observed by THEMIS (Timed History of Events and Macroscale Interactions during Substorms) satellites (probes). Only three of these events resulted in ULF wave activity. The periods of the waves are found to be 3.3, 6.0, and 7.6 min. East-west magnetic and radial electric field perturbations, which typically indicate the toroidal mode, are found to be stronger and can have phase relationships consistent with standing waves. Our results suggest that the two largest-amplitude ULF responses to SIs in the nightside plasma sheet are tailward-moving vortices, which have previously been reported, and the dynamic response of cross-tail currents in the magnetotail to maintain force balance with the solar wind, which has not previously been reported as a ULF wave driver. Both mechanisms could potentially drive standing Alfven waves (toroidal modes) observed via the field-line resonance mechanism. Furthermore, both involve frequency selection and a preference for certain driving conditions that can explain the small number of ULF wave events associated with SIs in the nightside plasma sheet. Citation: Shi, Q. Q., et al. (2013), THEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events, J. Geophys. Res. Space Physics, 118, 284-298, doi:10.1029/2012JA017984.; Astronomy & Astrophysics; SCI(E); 10; ARTICLE; 1; 284-298; 118
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/290572]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Shi, Q. Q.,Hartinger, M.,Angelopoulos, V.,et al. THEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events[J]. journal of geophysical research space physics,2013.
APA	Shi, Q. Q..,Hartinger, M..,Angelopoulos, V..,Zong, Q.G..,Zhou, X.Z..,...&Yao, Z. H..(2013).THEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events.journal of geophysical research space physics.
MLA	Shi, Q. Q.,et al."THEMIS observations of ULF wave excitation in the nightside plasma sheet during sudden impulse events".journal of geophysical research space physics (2013).