Relating field-aligned beams to inverted-V structures and visible   auroras

doi:10.5194/angeo-33-1263-2015

CORC > 北京大学 > 地球与空间科学学院

	Relating field-aligned beams to inverted-V structures and visible auroras
	Lee, E. ; Parks, G. K. ; Fu, S. Y. ; Fillingim, M. ; Cui, Y. B. ; Hong, J. ; Dandouras, I. ; Reme, H.
刊名	ANNALES GEOPHYSICAE
	2015
关键词	Ionosphere auroral ionosphere particle acceleration magnetospheric physics auroral phenomena ION-BEAMS ELECTRIC-FIELDS SOLITARY WAVES DOUBLE-LAYERS SATELLITE OBSERVATIONS SOLAR CORONA CLUSTER ZONE MAGNETOSPHERE DISTRIBUTIONS
DOI	10.5194/angeo-33-1263-2015
英文摘要	The ion composition experiment on Cluster measures 3-D distributions in one spin of the spacecraft (4 s). These distributions often measure field-aligned ion beams (H+, He+ and O+) accelerated out of the ionosphere. The standard model of these beams relies on a quasi-static U-shaped potential model. The beams contain important information about the structure and distribution of the U-shaped potential structures. For example, a simple beam with a narrow velocity range tells us that the particles are accelerated going through a quasi-static U-shaped potential structure localized in space. A more complex beam with a large range of velocities varying smoothly (a few tens of kilometers per second to > 100 km s(-1)) tells us that the potential structure is extended and distributed along the magnetic field. The Cluster experiment has now revealed new features about the beams. Some beams are broken into many individual structures each with their own velocity. The U-shaped potential model would interpret the new features in terms of particles accelerated by narrow isolated potential structures maintained over an extended region of the magnetic field. Another interpretation is that these features arise as Cluster traverses toward the center of a small-scale U-shaped potential region detecting particles accelerated on different equipotential contours. The estimate of the distance of the adjacent contours is similar to 590-610m at a Cluster height of similar to 3.5 R-E. The observed dimensions map to similar to 295-305m in the ionosphere, suggesting Cluster has measured the potential structure of an auroral arc.; NASA [NNX11AD49G-2/15]; BK21 Plus Program; Basic Science Research Program through the National Research Foundation - Ministry of Education of Korea; SCI(E); ARTICLE; parks@ssl.berkeley.edu; 10; 1263-1269; 33
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/420981]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Lee, E.,Parks, G. K.,Fu, S. Y.,et al. Relating field-aligned beams to inverted-V structures and visible auroras[J]. ANNALES GEOPHYSICAE,2015.
APA	Lee, E..,Parks, G. K..,Fu, S. Y..,Fillingim, M..,Cui, Y. B..,...&Reme, H..(2015).Relating field-aligned beams to inverted-V structures and visible auroras.ANNALES GEOPHYSICAE.
MLA	Lee, E.,et al."Relating field-aligned beams to inverted-V structures and visible auroras".ANNALES GEOPHYSICAE (2015).