Temporal and spatial variation of the ion composition in the ring   current

doi:10.1023/A:1005212906199

CORC > 北京大学 > 地球与空间科学学院

	Temporal and spatial variation of the ion composition in the ring current
	Fu, SY ; Zong, QG ; Wilken, B ; Pu, ZY
刊名	空间科学评论
	2001
关键词	SOLAR-WIND GEOMAGNETIC STORM AMPTE-CCE MAGNETOSPHERE MAGNETOSHEATH POPULATION
DOI	10.1023/A:1005212906199
英文摘要	A global view of the ring current ions is presented using data acquired by the instrument MICS onboard the CRRES satellite during solar maximum. The variations of differential intensities, energy spectra, radial profile of the energetic particles and the origin of the magnetic local time (MLT) asymmetry of the ring current have been investigated in detail. O+ ions are an important contributor to the storm time ring current. Its abundance in terms of number density increases with increasing geomagnetic activity as well as its energy density. However, a saturation value for the energy density of O+ ions has been found. The low-energy H+ ions show a dramatic intensification and a rapid decay. However, its density ratio during the storm maximum is almost constant. On the other hand, high-energy H+ ions first exhibit a flux decrease followed by a delayed increase. Its density ratio shows an anti-correlation with the storm intensity. Both the positions of the maximum flux of O+ and He+ depend on storm activity: they move to lower altitudes in the early stage of a storm and move back to higher L-values during the recovery phase. Whereas the position of H+ and He++ show almost no dependence on the Dst index. The energy density distributions in radial distance and magnetic local time show drastic differences for different ion species. It demonstrates that the ring current asymmetry mainly comes from oxygen and helium ions, but not from protons. The outward motion of O+ around local noon may have some implications for oxygen bursts in the magnetosheath during IMF Bz negative conditions as observed by GEOTAIL.; Astronomy & Astrophysics; SCI(E); 16; REVIEW; 1-2; 539-554; 95
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/211899]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Fu, SY,Zong, QG,Wilken, B,et al. Temporal and spatial variation of the ion composition in the ring current[J]. 空间科学评论,2001.
APA	Fu, SY,Zong, QG,Wilken, B,&Pu, ZY.(2001).Temporal and spatial variation of the ion composition in the ring current.空间科学评论.
MLA	Fu, SY,et al."Temporal and spatial variation of the ion composition in the ring current".空间科学评论 (2001).