On the east-west longitudinally asymmetric distribution of solar proton events

doi:10.1093/mnras/stw2255

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院地球与行星物理重点实验室

	On the east-west longitudinally asymmetric distribution of solar proton events
	He, H. -Q.; Wan, W.
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2017
卷号	464 期号:1 页码:85-93
关键词	Diffusion Turbulence Sun: Particle Emission Cosmic Rays
ISSN号	0035-8711
DOI	10.1093/mnras/stw2255
文献子类	Article
英文摘要	A large data set of 78 solar proton events observed near the Earth's orbit during 1996-2011 is investigated. An east-west longitudinal (azimuthal) asymmetry is found to exist in the distribution of flare sources of solar proton events. With the same longitudinal separation between the flare sources and the magnetic field line footpoint of observer, the number of the solar proton events originating from solar sources located on the eastern side of the nominal magnetic footpoint of observer is larger than the number of the solar proton events from solar sources located on the western side. We emphasize the importance of this statistical investigation in two aspects. On the one hand, this statistical finding confirms our previous simulation results obtained by numerically solving five-dimensional Fokker-Planck equation of solar energetic particle (SEP) transport. On the other hand, the east-west longitudinally (azimuthally) asymmetric distribution of solar proton events accumulated over a long time period provides an observational evidence for the effects of perpendicular diffusion on the SEP propagation in the heliosphere. We further point out that, in the sense of perpendicular diffusion, our numerical simulations and statistical results of SEP events confirm each other. We discuss in detail the important effects of perpendicular diffusion on the formation of the east-west azimuthal (longitudinal) asymmetry of SEP distribution in two physical scenarios, i.e. 'multiple SEP events with one spacecraft' and 'one SEP event with multiple spacecraft'. A functional relation I-max(r) = kr(-1.7) quantifying the radial dependence of SEP peak intensities is obtained and utilized in the analysis of physical mechanism. The relationship between our results and those of Dresing et al. is also discussed.
WOS关键词	INTERPLANETARY MAGNETIC-FIELDS ; ENERGETIC PARTICLES ; PERPENDICULAR DIFFUSION ; INNER HELIOSPHERE ; TRANSPORT ; PROPAGATION ; IONS
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000393646300006
资助机构	National Natural Science Foundation of China(41204130 ; National Important Basic Research Project(2011CB811405) ; Chinese Academy of Sciences(KZZD-EW-01-2) ; Open Research Program from Key Laboratory of Geospace Environment, Chinese Academy of Sciences ; International Postdoctoral Exchange Fellowship Program of China(20130023) ; K. C. Wong Education Foundation ; 41474154 ; 41321003 ; 41131066) ; National Natural Science Foundation of China(41204130 ; National Important Basic Research Project(2011CB811405) ; Chinese Academy of Sciences(KZZD-EW-01-2) ; Open Research Program from Key Laboratory of Geospace Environment, Chinese Academy of Sciences ; International Postdoctoral Exchange Fellowship Program of China(20130023) ; K. C. Wong Education Foundation ; 41474154 ; 41321003 ; 41131066) ; National Natural Science Foundation of China(41204130 ; National Important Basic Research Project(2011CB811405) ; Chinese Academy of Sciences(KZZD-EW-01-2) ; Open Research Program from Key Laboratory of Geospace Environment, Chinese Academy of Sciences ; International Postdoctoral Exchange Fellowship Program of China(20130023) ; K. C. Wong Education Foundation ; 41474154 ; 41321003 ; 41131066) ; National Natural Science Foundation of China(41204130 ; National Important Basic Research Project(2011CB811405) ; Chinese Academy of Sciences(KZZD-EW-01-2) ; Open Research Program from Key Laboratory of Geospace Environment, Chinese Academy of Sciences ; International Postdoctoral Exchange Fellowship Program of China(20130023) ; K. C. Wong Education Foundation ; 41474154 ; 41321003 ; 41131066)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53093]
专题	地质与地球物理研究所_中国科学院地球与行星物理重点实验室
通讯作者	He, H. -Q.
作者单位	Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	He, H. -Q.,Wan, W.. On the east-west longitudinally asymmetric distribution of solar proton events[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,464(1):85-93.
APA	He, H. -Q.,&Wan, W..(2017).On the east-west longitudinally asymmetric distribution of solar proton events.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,464(1),85-93.
MLA	He, H. -Q.,et al."On the east-west longitudinally asymmetric distribution of solar proton events".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 464.1(2017):85-93.