Element Abundances and Source Plasma Temperatures of Solar Energetic Particles

[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

[发布机构] IPST, Univ. of Maryland, College Park; MD; 20742-2431, United States^1

[效力级别] 天文学 [学科分类] 天文学(综合)

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