Presentation 1 : Poster
Coronal electron acceleration and relativistic particles at 1 AU (PNST)
Karl-Ludwig Klein, G\'erard Trottet, Jean-Pierre Delaboudini\`ere
Large solar energetic particle events are widely believed to reveal
particles accelerated at extended shock waves driven by rapid coronal
mass ejections (CMEs). This view is largely founded on the analysis of
rather low-energy ions (up to some MeV/nucleon), as well as on an
extremely simplified model of flares which are considered as point-like
events in space and time. We show, using imaging observations with the
Nancay Radioheliograph and EIT and LASCO on SoHO, that during
relativistic particle events widespread and long lived acceleration
sites exist in the solar corona, far behind the CME and its presumed
shock, and that considerations of timing and of access to the Earth
suggest that these sites may play a role in accelerating relativistic
protons detected by neutron monitors at the Earth.