Coronal Shocks and Solar Energetic Proton Events
Abstract
From July 1996 - June 2001, < 50% of favorably-located metric type II radio bursts had associated solar energetic protons (SEPs). When western hemisphere metric 115 were accompanied by decametric-hectometric(DH; 1-14 MHz) type II emission, their association with ^20 MeV SEP events was 90% vs. only 25% for metric 115 without a DH counterpart. Overall, 82% (63%) of all SEP events with visible disk origins were associated with metric (DH) type 115, 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 call 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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2003
- Accession Number
- ADA423041
Entities
People
- D. V. Reames
- Edward W. Cliver
- Stephen W. Kahler
Organizations
- Air Force Research Laboratory