Abstract
A coronal hard X-ray source observed by Yohkoh during solar flares can be interpreted under assumption that a fast plasma outflow from a reconnecting current sheet creates a shock wave above loops of strong magnetic field. Since the HXR source is located in the upstream side, rather than in the downstream side of the shock, this provides a new opportunity of particle acceleration — the two-step acceleration of electrons and ions. The first step is acceleration by the strong electric field present inside the current sheet. The second step is fast ‘adiabatic heating’ inside the collapsing magnetic trap. We demonstrate some possibilities of ion acceleration in collapsing traps.
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