Coronal electron acceleration and relativistic particles at 1 AU

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

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.

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