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An X17.2 solar flare occurred on 2003 October 28, accompanied bymulti-wavelength emissions and a high flux of relativistic particles observedat 1AU. We present the analytic results of the TRACE, SOHO, RHESSI, ACE, GOES,hard X-ray (INTEGRAL satellite), radio (Onderejov radio telescope), and neutronmonitor data. It is found that the inferred magnetic reconnection electricfield correlates well with the hard X-ray, gamma-ray, and neutron emission atthe Sun. Thus the flare's magnetic reconnection probably makes a crucialcontribution to the prompt relativistic particles, which could be detected at 1AU. Since the neutrons were emitted a few minutes before the injection ofprotons and electrons, we propose a magnetic-field evolution configuration toexplain this delay. We do not exclude the effect of CME-driven shock, whichprobably plays an important role in the delayed gradual phase of solarenergetic particles.

Flare magnetic reconnection and relativistic particles in the 2003 October 28 event