Physics
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..119..357m&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 119, no. 2, 1989, p. 357-384.
Physics
16
Magnetic Field Configurations, Solar Flares, H Alpha Line, Radial Velocity, Solar Prominences, Solar X-Rays, Sunspots, Temporal Distribution
Scientific paper
Recent general results on the study of properties of flare homology, and thir relevance to the physical interpretation of the flare phenomenon at large, are discussed. Attention is given to the discovery of homologous flares which occur in rapid succession (within a few minutes of each other in many cases). These flares are designated 'rafales'. These flares signal the existence of several episodes of energy release within the same magnetic configuration. The existence of particular sites in the solar atmosphere which have peculiar characteristics in terms of solar rotation, and where recurrent flaring may take place over and over again in different solar rotations indicate that the disturbance causing the emergence of activity is deep-seated, below the solar photosphere. An extensive set of observations of two homologous flares of a rafale demonstrate the dynamic aspects of the observations, particularly the presence of peaks in the vertical component of the velocity field. These results are shown to be in agreement with studies of filament activations and the surging arches which are observed before the flash phase of solar flares.
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