Broken Power-law Distributions from Low Coronal Compression Regions or Shocks

[摘要] Coronal Mass Ejection (CME) expansion regions low in the corona (s) are highly efficient for the acceleration of energetic particles. Because the acceleration occurs over a finite spatial region, there is a regime where particles diffuse away and escape from the acceleration sites, leading to the formation of broken power-law distributions. This paper highlights recent results indicating that CME expansion and acceleration in the low corona may cause rapid particle acceleration and create large solar energetic particle events with broken power-law distributions.

[发布机构] University of New Hampshire, Durham; NH; 03824, United States^1;Southwest Research Institute, San Antonio; TX; 78228, United States^2;Predictive Science Inc., San Diego; CA; 92121, United States^3;University of Arizona, Tucson; AZ; 85721, United States^4;Harvard-Smithsonean Center for Astrophysics, Cambridge; MA; 02138, United States^5

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Broken power law;Compression regions;Coronal mass ejection;Energetic particles;Particle acceleration;Solar energetic particle events;Spatial regions