Alfven Waves in the Solar Wind in Association with Solar Energetic Particles: Sunspot Umbral Origin.
Final rept. 1 Oct 80-31 Mar 83,
FRANKLIN INST NEWARK DE BARTOL RESEARCH FOUNDATION
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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
- Nuclear Physics and Elementary Particle Physics