Qin, G (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing 100190, Peoples R China.
; Qin, G (reprint author), Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China.
; Qin, G (reprint author), Harbin Inst Technol, Sch Sci, Shenzhen 518055, Peoples R China.
National Natural Science Foundation of China [41304135, 41574172, 41374177, 41125016]
; CMA [GYHY201106011]
; Specialized Research Fund for State Key Laboratories of China
英文摘要:
Recently, S. W. Kahler studied the timescales of solar energetic particle (SEP) events associated with coronal mass ejections (CMEs) from analysis of spacecraft data. They obtained different timescales for SEP events, such as TO, the onset time from CME launch to SEP onset, TR, the rise time from onset to half the peak intensity (0.5I(p)), and TD, the duration of the SEP intensity above 0.5I(p). In this work, we solve the transport equation for SEPs considering interplanetary coronal mass ejection (ICME) shocks as energetic particle sources. With our modeling assumptions, our simulations show similar results to Kahler's analysis of spacecraft data, that the weighted average of TD increases with both CME speed and width. Moreover, from our simulation results, we suggest TD is directly dependent on CME speed, but not dependent on CME width, which were not found in the analysis of observational data.
