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

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

2007-06-25

arxiv.org/abs/0706.3648v1

Astronomy and Astrophysics

Astrophysics

5 pages, 7 figures, accepted by A&A

Scientific paper

10.1051/0004-6361:20066966

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

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