Energy spectra of 3He-rich solar energetic particles associated with coronal waves

[摘要] In addition to their anomalous abundances,3He-rich solar energetic particles (SEPs) show puzzling energy spectral shapes varying from rounded forms to power laws where the later are characteristics of shock acceleration. Solar sources of these particles have been often associated with jets and narrow CMEs, which are the signatures of magnetic reconnection involving open field. Recent reports on new associations with large-scale EUV waves bring new insights on acceleration and transport of3He-rich SEPs in the corona. We examined energy spectra for 323He-rich SEP events observed by ACE at L1 near solar minimum in 2007-2010 and compared the spectral shapes with solar flare signatures obtained from STEREO EUV images. We found the events with jets or brightenings tend to be associated with rounded spectra and the events with coronal waves with power laws. This suggests that coronal waves may be related to the unknown second stage mechanism commonly used to interpret spectral forms of3He-rich SEPs.

[发布机构] Institut für Astrophysik, Georg-August-Universität Göttingen, Göttingen; D-37077, Germany^1;Max-Planck-Institut für Sonnensystemforschung, Göttingen; D-37077, Germany^2;Max Planck/Princeton Center for Plasma Physics, Princeton; NJ; 08540, United States^3;Applied Physics Laboratory, Johns Hopkins University, Laurel; MD; 20723, United States^4;Jet Propulsion Laboratory, California Institute of Technology, Pasadena; CA; 91109, United States^5

[效力级别] 天文学 [学科分类] 天文学(综合)

[关键词] Coronal waves;Energy spectra;Energy spectral;Magnetic reconnections;Shock acceleration;Solar energetic particles;Solar minima;Spectral shapes