OBSERVATIONS OF EUV WAVES IN 3He-RICH SOLAR ENERGETIC PARTICLE EVENTS

被引:8
作者
Bucik, R. [1 ,2 ,3 ]
Innes, D. E. [1 ,2 ]
Guo, L. [1 ,2 ]
Mason, G. M. [4 ]
Wiedenbeck, M. E. [5 ]
机构
[1] Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany
[2] Max Planck Princeton Ctr Plasma Phys, Princeton, NJ 08540 USA
[3] Univ Gottingen, Inst Astrophys, D-37077 Gottingen, Germany
[4] Johns Hopkins Univ, Appl Phys Lab, Laurel, MD 20723 USA
[5] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
基金
美国国家科学基金会;
关键词
acceleration of particles; Sun: flares; Sun: particle emission; waves; STOCHASTIC ACCELERATION; STEREO MISSION; FLARES; SPACECRAFT; TELESCOPE; ELECTRON; HEAVY; ASSOCIATION; CONNECTION; SDO/AIA;
D O I
10.1088/0004-637X/812/1/53
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Small He-3-rich solar energetic particle (SEP) events with their anomalous abundances, markedly different from the solar system, provide evidence for a unique acceleration mechanism that operates routinely near solar active regions. Although the events are sometimes accompanied by coronal mass ejections (CMEs), it is believed that mass and isotopic fractionation is produced directly in the flare sites on the Sun. We report on a large-scale extreme-ultraviolet (EUV) coronal wave observed in association with He-3-rich SEP events. In the two examples discussed, the observed waves were triggered by minor flares and appeared concurrently with EUV jets and type III radio bursts, but without CMEs. The energy spectra from one event are consistent with so-called class-1 (characterized by power laws) He-3-rich SEP events, while the other with class-2 (characterized by rounded He-3 and Fe spectra), suggesting different acceleration mechanisms in the two. The observation of EUV waves suggests that large-scale disturbances, in addition to more commonly associated jets, may be responsible for the production of He-3-rich SEP events.
引用
收藏
页数:7
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