NUMERICAL STUDY OF THE LONGITUDINALLY ASYMMETRIC DISTRIBUTION OF SOLAR ENERGETIC PARTICLES IN THE HELIOSPHERE
作者单位：Key Laboratory of Earth and Planetary PhysicsInstitute of Geology and GeophysicsChinese Academy of Sciences CAS Key Laboratory of Geospace EnvironmentDepartment of Geophysics and Planetary SciencesUniversity of Science and Technology of China
会议名称：《中国科学院地质与地球物理研究所2015年度（第15届）学术年会》
会议日期：2016年
学科分类：070802[理学-空间物理学] 07[理学] 0708[理学-地球物理学]
基 金：supported in part by the National Natural Science Foundation of China under grants 41204130,41474154,41321003,and 41131066 the National Important Basic Research Project under grant 2011CB811405 the Chinese Academy of Sciences under grant KZZD-EW-01-2 the China Postdoctoral Science Foundation under grants 2011M500381 and 2012T50131 the Open Research Program from Key Laboratory of Geospace Environment,Chinese Academy of Sciences the Key Laboratory of Random Complex Structures and Data Science,CAS the support of the K.C.Wong Education Foundation
关 键 词：interplanetary medium magnetic fields solar–terrestrial relations Sun:flares Sun:particle emission
摘 要：Solar energetic particles(SEPs) affect the solar–terrestrial space environment and are very important to space weather *** this work,we numerically investigate the transport processes of SEPs in the three-dimensional interplanetary magnetic field,with an emphasis on the longitudinal distribution of SEPs in the *** confirm our previous finding that there exists an east–west longitudinal asymmetry in the SEP intensities,i.e.,with the same longitude separations between the solar source centers and the magnetic footpoint of the observer,the fluxes of SEP events originating from solar sources located on the eastern side of the nominal magnetic footpoint of the observer are systematically larger than those of the SEP events originating from sources located on the western *** discuss the formation mechanism of this phenomenon,and conclude that the longitudinally asymmetric distribution of SEPs results from the east–west azimuthal asymmetry in the topology of the heliospheric magnetic field as well as the effects of perpendicular diffusion on the transport of SEPs in the *** results will be valuable to understanding Sun–Earth relations and useful for space weather forecasting.