Physics
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..138..353s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 138, no. 2, April 1992, p. 353-360.
Physics
13
H Alpha Line, Solar Flares, Solar Magnetic Field, Solar Prominences, Energy Sources, Free Energy, Magnetic Energy Storage, Solar Activity Effects
Scientific paper
The shear angle of the neutral line of the nonpotential magnetic field has been evaluated for one or two days prior to and after the flare event for 10 cases. The H-alpha filament positions were used to evaluate the shear in the neutral line. It is found that it is the change in the shear that occurs a day prior to the flare that can lead to the event. This change can be in either direction, i.e., it can be a large increase from a small value or a decrease from a large initial value. Thus it is the change in the shear angle that seems to be a deciding criterion for a flare to occur and not a large value for the shear angle itself. One instance is found where there was no significant change in the shear angle over a period of a few days and this region, although similar to other active regions studied, did not produce any flare activity.
Aleem S. M.
Rausaria R. R.
Sivaraman K. R.
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