SIMULATIONS OF THE SPATIAL AND TEMPORAL INVARIANCE IN THE SPECTRA OF GRADUAL SOLAR ENERGETIC PARTICLE EVENTS

被引：16
作者：
Wang, Yang [1 ]
Qin, Gang [1 ]
机构：
[1] Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing 100190, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2015年 / 806卷 / 02期
关键词：
Sun: activity; Sun: coronal mass ejections (CMEs); Sun: particle emission; EJECTION-DRIVEN SHOCKS; HYDROMAGNETIC WAVE EXCITATION; PROTON PEAK INTENSITIES; SMALL-SCALE GRADIENTS; CHARGED-PARTICLES; PERPENDICULAR TRANSPORT; FOCUSED TRANSPORT; COSMIC-RAYS; DIFFUSION-COEFFICIENTS; INTERPLANETARY SHOCKS;
D O I：
10.1088/0004-637X/806/2/252
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The spatial and temporal invariance in the spectra of energetic particles in gradual solar events is reproduced in simulations. Based on a numerical solution of the focused transport equation, we obtain the intensity time profiles of solar energetic particles (SEPs) accelerated by an interplanetary shock in three-dimensional interplanetary space. The shock is treated as a moving source of energetic particles with a distribution function. The time profiles of particle fluxes. with different energies are calculated in the ecliptic at 1 AU. According to our model, we find that shock acceleration strength, parallel diffusion, and adiabatic cooling are the main factors in forming the spatial invariance in SEP spectra, and perpendicular diffusion is a secondary factor. In addition, the temporal invariance in SEP spectra is mainly due to the effects of adiabatic cooling. Furthermore, a spectra invariant region, which agrees with observations but is different from. the one suggested by Reames et al. is proposed based on our simulations.
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页数：8
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