Coronal electron acceleration and relativistic proton production during the 14 July 2000 flare and CME

The large solar are of 14 July 2000 10 UT occurred in an active region near the central meridian. It was accompanied by the eruption of a filament and a rapid halo-type coronal mass ejection (CME). Large particle fluxes were detected up to relativistic energies at 1 AU. In this paper accelerated par ticles and plasma structures in the corona are traced using radio, X-ray, E UV and visible light observations, together with neutron monitor measuremen ts of relativistic protons at 1 AU. Both the bulk of the radio emission at decimetric and longer waves and the escape of suprathermal electrons and re lativistic protons from the Sun were delayed by 10-20 min with respect to t he hard X-ray emission. Despite the delay and the association with a are ne ar the central meridian the neutron monitor time profile was impulsive. We show that the escape of the relativistic protons occurred in time coinciden t both with a coronal shock wave, which may be the bow shock of the CME, an d with radio sources which trace electron acceleration and magnetic field r econfiguration in the western hemisphere. Three observations support the id ea that the relativistic protons were accelerated during this reconfigurati on, at heights between 0.1 and 1 R-. above the photosphere, and not in the flaring active region or at the bow shock of the CME: (i) the rise of the n eutron monitor count rates is simultaneous with the brightening of a new co ntinuum radio source; (ii) the duration of the continuum emission is simila r to the rise time of the neutron monitor count rates; (iii) the radio sour ce is close to the Earth-connected interplanetary magnetic field line.