Element Abundances and Source Plasma Temperatures of Solar Energetic Particles

15th Annual International Astrophysics Conference: "The Science of Ed Stone: Celebrating his 80th Birthday"

物理学;天文学

Reames, Donald V.^1

IPST, Univ. of Maryland, College Park

MD

20742-2431, United States^1

关键词: Coronal temperatures;    Element abundances;    Magnetic reconnections;    Mass-to-charge ratio;    Open field lines;    Plasma temperature;    Shock acceleration;    Solar energetic particles;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/767/1/012023/pdf
DOI  :  10.1088/1742-6596/767/1/012023

学科分类：天文学(综合)

来源: IOP

【 摘 要 】

Thirty years ago Breneman and Stone [1] observed that the enhancement or suppression of element abundances in large solar energetic-particle (SEP) events varies as a power of the mass-to-charge ratio, A/Q, of the elements. Since Q during acceleration or transport may depend upon the source plasma temperature T, the pattern of element enhancements can provide a best-fit measure of T. The small SEP events we call3He-rich or "impulsive" show average enhancements, relative to coronal abundances, rising as the 3.6 power of A/Q to a factor of ∼1000 for (76