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

14th Annual International Astrophysics Conference: Linear and Nonlinear Particle Energization throughout the Heliosphere and Beyond

物理学;天文学

Schwadron, N.A.^1 ; Lee, M.A.^1 ; Gorby, M.^1 ; Lugaz, N.^1 ; Spence, H.E.^1 ; Desai, M.^2 ; Török, T.^3 ; Downs, C.^3 ; Linker, J.^3 ; Lionello, R.^3 ; Miki, Z.^3 ; Riley, P.^3 ; Giacalone, J.^4 ; Jokipii, J.R.^4 ; Kota, J.^4 ; Kozarev, K.^5

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

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

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/642/1/012025/pdf
DOI  :  10.1088/1742-6596/642/1/012025

学科分类：天文学(综合)

来源: IOP

【 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.