Topical Discussion Meeting - Debate on acceleration mechanisms involved in the generation of SEP events

Olga Malandraki (National Observatory of Athens/IAASARS, Greece), Norma B. Crosby (Royal Belgian Institute for Space Aeronomy, Belgium), Nicole Vilmer (LESIA, Observatoire de Paris, France)
Wednesday 20/11, 11:15-12:30

It is well-established that Solar Energetic Particles (SEPs) pose a threat to modern technology relying on spacecraft as well as to humans in space, as they are a serious radiation hazard. Therefore, it is vital to develop our ability to predict where and when SEPs occur. This depends fundamentally on an understanding of the underlying physical mechanisms that control energetic particle acceleration and propagation. To this end, in this TDM we will have an open discussion on the following key question: 'What are the relative contributions of flare-related magnetic reconnection-driven acceleration process, CME-shock associated Diffusive Shock Acceleration and other mechanisms to SEP events?'. This is a hot issue in our space weather community and new missions such as the Parker Solar Probe and Solar Orbiter are expected to shed light on this topic.

To set the scene about the current understanding on the topic the TDM will start with an expert giving a review talk and this will be followed by open discussion on this key question. Participants are encouraged to take part actively in the discussion by giving 1-2 min slide presentations, expressing their opinion and presenting evidence for the various scenarios.