Physics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...96..307s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 96, April 1985, p. 307-316.
Physics
17
Magnetic Effects, Magnetic Flux, Nonequilibrium Conditions, Solar Flares, Solar Magnetic Field, Dynamo Theory, Magnetic Signatures, Photosphere, Time Dependence
Scientific paper
Using a photospheric magnetogram of the solar activity complex HR 16862, 16863, 16864 at the end of May 1980 as boundary data a sequence of three-dimensional force-free magnetic fields with spatially constant alpha is calculated, including numerical field-line tracing. The field is assumed not to be frozen-in and the absolute value of alpha, which is a measure of the magnetic free energy, is assumed to increase with time due to some dynamo mechanism. Variation of alpha, starting from alpha = 0, produces a castastrophe-like change of the topology of a field-line system corresponding to an arch filament system connecting the leading spot of HR 16863 with the trailing spot of HR 16862. This topological change is interpreted as causing a series of large homologous flares with synchronous flaring in the two spots. The catastrophe-like behavior of the field topology is attributed to the nonlinear field-line equations.
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