Coronal Shocks and Solar Energetic Proton Events

Details Coronal Shocks and Solar Energetic Proton Events Coronal Shocks and Solar Energetic Proton Events

Jul 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003icrc....6.3331c&link_type=abstract

Proceedings of the 28th International Cosmic Ray Conference. July 31-August 7, 2003. Trukuba, Japan. Under the auspices of the I

Physics

Scientific paper

From July 1996 June 2001, < 50% of favorably-lo cated metric type I I radio bursts had associated solar energetic protons (SEPs). When western hemisphere metric I Is were accompanied by decametric-hectometric (DH; 1-14 MHz) type I I emission, their association with ˜20 MeV SEP events was 90% vs. only 25% for metric I Is without a DH counterpart. Overall, 82% (63%) of all SEP events with visible disk origins were associated with metric (DH) type I Is, with percentage associations increasing with SEP event size to 88% (96%), respectively, for ˜20 MeV SEP events with peak intensities ≥ 10-1 pr cm-2 s-1 sr-1 MeV-1 . Our results are consistent with the following (not mutually exclusive) possibilities: (1) large ˜20 MeV SEP events result from strong shocks that can persist well beyond ˜3 R ; (2) shock acceleration is most efficient above ˜3 R ; (3) shocks that survive to ˜3 R are more likely to have broad longitudinal extents.

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