Alfven Waves in the Solar Wind in Association with Solar Energetic Particles: Sunspot Umbral Origin.
Abstract
We report on a search for Alfven waves in the solar wind during solar particle events. During the period June 6-8, 1979, we find clear signatures of outgoing Alfven waves which could have been released from the sun simultaneously with the initial release of energetic particles. The waves are soliton-like, with durations of 200-900 seconds. An isolated square Alfven solution is also seen when the first particles (with E approximately 57 MeV) are detected: the width of this solution is approximately 950 seconds. A series of five small amplitude spikes in the magnetic field are also seen, preceding the arrival of the first particles by a few hours. The spikes are separated by intervals of 854 + or - 20 seconds. We suggest that these periodicities are determined by conditions at the sun. The features which we have detected are consistent with Alfven waves released from the umbra of a sunspot during a flare. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 04, 1983
- Accession Number
- ADA128046
Entities
People
- A. J. Owens
- D. J. Mullan