The 2015 June 21 Coronal Mass Ejection and the Associated Solar Energetic Particle Event
Abstract
The 2015 June 21 coronal mass ejection (CME) was associated with an M-class solar flare, a large solar energetic particle (SEP) event, an intense type II burst and a geomagnetic storm. We have analyzed the available white-light, EUV, and radio remote sensing and in-situ solar wind observations and constructed the Sun-to-Earth evolution of the 2015 June 21 CME-driven shock. Our analysis suggests that an equatorial coronal hole deflected the CME propagation, which affected the intensity profile of the associated SEP event and the duration of the interplanetary CME at Earth. We found that the CME-driven shock accelerated rapidly in the inner corona, after which the speed increase slowed down in the outer corona and finally decreased in the inner heliosphere. We also found that the metric type II emission originated from the flanks of the shock. We suggest that the observed very soft fluence spectrum and the unusually long delay of the SEP event onset is consistent with coronal hole deflection that weakened the shock flank and resulted in poor magnetic connectivity of the particle event, and with the acceleration profile of the CME-driven shock.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2018
- Bibcode:
- 2018AGUFMSH33F3704M
- Keywords:
-
- 2114 Energetic particles;
- INTERPLANETARY PHYSICSDE: 2139 Interplanetary shocks;
- INTERPLANETARY PHYSICSDE: 7513 Coronal mass ejections;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMYDE: 7519 Flares;
- SOLAR PHYSICS;
- ASTROPHYSICS;
- AND ASTRONOMY