Observation of particle acceleration in the solar corona with neutron monitors and radio instruments
Abstract
In the attempt to identify regions and mechanisms of relativistic proton acceleration at the Sun, we compare the arrival of the first particles at Earth, measured by neutron monitors, with radio signatures of electron acceleration in the corona. The first proton arrival is often, but not always, delayed with respect to the early radio signatures at the Sun. But the release at the Sun always occurs at times when the radio emission is ongoing. This is in line with earlier studies of individual events, which made us conclude that relativistic protons are accelerated in flare-like processes related to magnetic reconnection or turbulence in the wake of a coronal mass ejection, rather than at the shocks driven by the ejected magnetic stuctures.
- Publication:
-
SF2A-2019: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics
- Pub Date:
- December 2019
- Bibcode:
- 2019sf2a.conf..271K
- Keywords:
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- Sun: particle emission;
- Sun: radio radiation;
- Sun: flares;
- Sun: coronal mass ejections (CMEs)