Physics
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983udnw.rept.....m&link_type=abstract
Final Report, 1 Oct. 1980 - 31 Mar. 1983 Delaware Univ., Newark. Research Foundation.
Physics
Magnetohydrodynamic Waves, Solar Corpuscular Radiation, Solar Flares, Solar Wind, Sunspots, International Sun Earth Explorer 3, Interplanetary Magnetic Fields, Propagation Velocity, Solitary Waves, Umbras
Scientific paper
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.
Mullan Dermott J.
Owens A. J.
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