On the evaluation of magnetic shear from H-alpha pictures

Details On the evaluation of magnetic shear from H-alpha pictures On the evaluation of magnetic shear from H-alpha pictures

Feb 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993soph..143..385v&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 143, no. 2, p. 385-387.

Physics

1

H Alpha Line, Solar Magnetic Field, Solar Physics, Solar Prominences, Solar Flares, Sunspots

Scientific paper

It is shown that pre-flare activity in H-alpha filaments is unrelated to changes in magnetic shear. Changes in the shear angle are found to be related to either redeployment of the sources of magnetic flux relative to the main sunspots or to the emergence of new flux. Without involving any measure of the transverse magnetic field, it is difficult to link changes in the shear angle with changes in magnetic shear. It is also determined that non-potential magnetic fields are necessary for the occurrence of flares.

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