Ring current oxygen ions escaping into the magnetosheath

doi:10.1029/2000JA000127

CORC > 北京大学 > 地球与空间科学学院

	Ring current oxygen ions escaping into the magnetosheath
	Zong, QG ; Wilken, B ; Fu, SY ; Fritz, TA ; Korth, A ; Hasebe, N ; Williams, J ; Pu, ZY
刊名	journal of geophysical research space physics
	2001
关键词	EARTHS BOW SHOCK SOLAR-WIND DAYSIDE MAGNETOSHEATH GEOTAIL OBSERVATIONS MAGNETOSPHERIC IONS ENERGETIC PARTICLES NOVEMBER 1 UPSTREAM FIELD MAGNETOPAUSE
DOI	10.1029/2000JA000127
英文摘要	Storm-related magnetospheric oxygen bursts were observed in the dayside magnetosheath during the coronal mass ejection on January 10, 1997. These singly charged oxygen ion events exhibited a clear antisunward flow. The oxygen ions are associated with a strong negative interplanetary magnetosheath field (IMF). The average B-z was almost - 50 nT, and the field projection in the x - y plane (GSE) was nearly constant in the Sun/dawn sector forming an angle of 45 degrees relative to the Earth-Sun axis. The magnetopause was identified as a rotational discontinuity by using the principal axis analysis (PAA) method. The three-dimensional polar versus azimuthal angle distribution of the oxygen ions showed that the oxygen flow has a north to south velocity component. The observations suggest that the dayside reconnection process is generally steady. The energy dispersion can be explained with the time-of-flight (TOF) effect assuming oxygen ions are escaping from the magnetosphere along the reconnected field lines. The lack of hydrogen and helium ions during the observed oxygen bursts can be explained, as only oxygen ions are resupplied by the gradient drift in the inner magnetosphere because of their larger bounce periods with respect to hydrogen and helium ions. Therefore only oxygen ions are observed continuously in the magnetosheath. The estimated oxygen escape rate amounts to 0.61 x 10(23) ions/s, about 33% of the input rate of the ring current. The observations imply that the stormtime ring current is asymmetric. A large amount of ring current oxygen ions escape from the magnetosphere into the magnetosheath.; Astronomy & Astrophysics; SCI(E); 27; ARTICLE; A11; 25541-25556; 106
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/211103]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Zong, QG,Wilken, B,Fu, SY,et al. Ring current oxygen ions escaping into the magnetosheath[J]. journal of geophysical research space physics,2001.
APA	Zong, QG.,Wilken, B.,Fu, SY.,Fritz, TA.,Korth, A.,...&Pu, ZY.(2001).Ring current oxygen ions escaping into the magnetosheath.journal of geophysical research space physics.
MLA	Zong, QG,et al."Ring current oxygen ions escaping into the magnetosheath".journal of geophysical research space physics (2001).