Physics
Scientific paper
Feb 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...61..187k&link_type=abstract
Solar Physics, vol. 61, Feb. 1979, p. 187-199.
Physics
7
Spectroheliographs, Statistical Analysis, Type 4 Bursts, Angular Distribution, Magnetohydrodynamic Waves, Solar Flares, Solar Magnetic Field, Spatial Distribution, Tables (Data), Velocity Distribution
Scientific paper
Thirty-one moving type IV (IV(M)) bursts recorded with the Culgoora radioheliograph are examined to deduce their characteristic features, such as spatial distribution, projected velocity, etc., and their relation to other phenomena. The distribution of the projected velocity suggests that less than 15% of the total IV(M) bursts have fast velocities (greater than 1000 km/s), almost equal to MHD shock velocity, and that the remaining IV(M) bursts have slower velocities (about 400 km/s) and are probably not associated with MHD shock waves. Most of the slow IV(M) bursts (and at least about 70% of the total IV(M) bursts) are of an isolated plasmoid type. Even if they are associated with minor H-alpha flares, IV(M) bursts of the isolated-plasmoid type have of the order of 10 to the 31st ergs in the form of magnetic energy. They are in many cases closely associated with extended flare-continuum sources; this seems plausible if the flare continuum is interpreted as an interaction of a plasmoid with a large-scale magnetic arch. The association of IV(M) bursts with energetic proton events seems to be poor, contrary to expectation.
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