Energy filter effect for solar wind particle entry to the plasma sheet   via flank regions during southward interplanetary magnetic field

doi:10.1029/2006JA012180

CORC > 北京大学 > 地球与空间科学学院

	Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field
	Zhou, X.-Z. ; Pu, Z. Y. ; Zong, Q.-G. ; Xie, L.
刊名	journal of geophysical research space physics
	2007
关键词	KELVIN-HELMHOLTZ INSTABILITY TANGENTIAL DISCONTINUITY GEOTAIL OBSERVATIONS MAGNETOSPHERE MAGNETOPAUSE MAGNETOTAIL BOUNDARY MODEL IONS
DOI	10.1029/2006JA012180
英文摘要	Several mechanisms have been used to explain solar wind plasma entry into the plasma sheet in the magnetotail. In this paper, we focus on the gradient drift entry (GDE) process in the equatorial flanks of the magnetosphere, based on the magnetopause picture of a tangential discontinuity with a small tangential electric field as was suggested by Alfven (1968). We discuss the GDE efficiency in different conditions using the adiabatic theory. It can be clearly shown that the GDE efficiency is much lower during southward interplanetary magnetic field (IMF), with a strong energy filter effect for incoming solar wind particles. Given a typical condition, a critical energy for particle entry is calculated to be several kiloelectron volts. Only those particles with higher energy can penetrate the magnetopause, a condition which can be also proved by test particle simulations. The lower efficiency than that during northward IMF during periods of southward IMF is in agreement with the different properties of the plasma sheet observed, i.e., hot and tenuous when the IMF is southward, cold and dense for northward IMF.; Astronomy & Astrophysics; SCI(E); 8; ARTICLE; A6; 112
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/250265]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zhou, X.-Z.,Pu, Z. Y.,Zong, Q.-G.,et al. Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field[J]. journal of geophysical research space physics,2007.
APA	Zhou, X.-Z.,Pu, Z. Y.,Zong, Q.-G.,&Xie, L..(2007).Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field.journal of geophysical research space physics.
MLA	Zhou, X.-Z.,et al."Energy filter effect for solar wind particle entry to the plasma sheet via flank regions during southward interplanetary magnetic field".journal of geophysical research space physics (2007).