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Propagation of Solar Energetic Particles in Three-dimensional Interplanetary Magnetic Fields: Radial Dependence of Peak Intensities

文献类型：期刊论文

作者He, H-Q.1; Zhou, G.1,2; Wan, W.1
刊名ASTROPHYSICAL JOURNAL
出版日期2017-06-20
卷号842期号:2
ISSN号0004-637X
关键词Diffusion Interplanetary Medium Sun: Magnetic Fields Sun: Particle Emission Solar-terrestrial Relations
DOI10.3847/1538-4357/aa7574
文献子类Article
英文摘要A functional form I-max(R) = kR(-alpha), where R is the radial distance of a spacecraft, was usually used to model the radial dependence of peak intensities I-max (R) of solar energetic particles (SEPs). In this work, the five-dimensional Fokker-Planck transport equation incorporating perpendicular diffusion is numerically solved to investigate the radial dependence of SEP peak intensities. We consider two different scenarios for the distribution of a spacecraft fleet: (1) along the radial direction line and (2) along the Parker magnetic field line. We find that the index alpha in the above expression varies in a wide range, primarily depending on the properties (e.g., location and coverage) of SEP sources and on the longitudinal and latitudinal separations between the sources and the magnetic foot points of the observers. Particularly, whether the magnetic foot point of the observer is located inside or outside the SEP source is a crucial factor determining the values of index alpha. A two-phase phenomenon is found in the radial dependence of peak intensities. The "position" of the break point (transition point/critical point) is determined by the magnetic connection status of the observers. This finding suggests that a very careful examination of the magnetic connection between the SEP source and each spacecraft should be taken in the observational studies. We obtain a lower limit of R-1.7 +/- 0.1 for empirically modeling the radial dependence of SEP peak intensities. Our findings in this work can be used to explain the majority of the previous multispacecraft survey results, and especially to reconcile the different or conflicting empirical values of the index alpha in the literature.
WOS关键词LONGITUDINALLY ASYMMETRIC DISTRIBUTION ; SEP EVENTS ; PROTON ; FLUENCES ; ACCELERATION ; HELIOSPHERE ; TRANSPORT ; FLUXES
WOS研究方向Astronomy & Astrophysics
语种英语
出版者IOP PUBLISHING LTD
WOS记录号WOS:000403419400001
资助机构National Natural Science Foundation of China(41474154 ; National Important Basic Research Project(2011CB811405) ; Chinese Academy of Sciences(KZZD-EW-01-2) ; Youth Innovation Promotion Association of the Chinese Academy of Sciences(2017091) ; 41204130 ; 41621063 ; 41131066) ; National Natural Science Foundation of China(41474154 ; National Important Basic Research Project(2011CB811405) ; Chinese Academy of Sciences(KZZD-EW-01-2) ; Youth Innovation Promotion Association of the Chinese Academy of Sciences(2017091) ; 41204130 ; 41621063 ; 41131066) ; National Natural Science Foundation of China(41474154 ; National Important Basic Research Project(2011CB811405) ; Chinese Academy of Sciences(KZZD-EW-01-2) ; Youth Innovation Promotion Association of the Chinese Academy of Sciences(2017091) ; 41204130 ; 41621063 ; 41131066) ; National Natural Science Foundation of China(41474154 ; National Important Basic Research Project(2011CB811405) ; Chinese Academy of Sciences(KZZD-EW-01-2) ; Youth Innovation Promotion Association of the Chinese Academy of Sciences(2017091) ; 41204130 ; 41621063 ; 41131066)
源URL[http://ir.iggcas.ac.cn/handle/132A11/52854]  
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1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Earth & Planetary Phys, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 He, H-Q.,Zhou, G.,Wan, W.. Propagation of Solar Energetic Particles in Three-dimensional Interplanetary Magnetic Fields: Radial Dependence of Peak Intensities[J]. ASTROPHYSICAL JOURNAL,2017,842(2).
APA He, H-Q.,Zhou, G.,&Wan, W..(2017).Propagation of Solar Energetic Particles in Three-dimensional Interplanetary Magnetic Fields: Radial Dependence of Peak Intensities.ASTROPHYSICAL JOURNAL,842(2).
MLA He, H-Q.,et al."Propagation of Solar Energetic Particles in Three-dimensional Interplanetary Magnetic Fields: Radial Dependence of Peak Intensities".ASTROPHYSICAL JOURNAL 842.2(2017).

入库方式： OAI收割

来源：地质与地球物理研究所

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