Late Type III Radio Emissions and Their Association With Solar Energetic Particles
Abstract
It is well known that the flares associated with high energy solar energetic particle (SEP) events exhibit 'second phase' phenomena. Although such flare events include type II radio emissions, indicative of the presence of shocks, it has been found that stationary type IV emission (produced by accelerated electrons in large scale loops) is a much better predictor of a large SEP event (e.g. Kahler, 1982). Electrons (and therefore ions) escape from the type IV source region as evidenced by type III radio bursts at low frequencies. These type III emissions that are associated with major proton events extend into, or occur after, the flare impulsive phase and have been named type III-l because the emission is 'late'. We have found an excellent correlation between the pattern of radio emissions and the associated particle events. However, other studies have investigated type III-l emissions and have found the association with SEP events to be less compelling. We explore the results of these studies in order to determine why this is the case.
- Publication:
-
Solar Heliospheric and INterplanetary Environment (SHINE 2017)
- Pub Date:
- July 2017
- Bibcode:
- 2017shin.confE.117C