Other
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..344a&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 344-355.
Other
14
Solar Flares, Solar Magnetic Field, Sunspots, Brightness, H Alpha Line, Shear, Solar Velocity
Scientific paper
A B-gamma(delta) sunspot group with growing delta-spots of trailing polarity shows evidence in H-alpha filament structure of a transition from a state of weak magnetic shear to a state of strong shear. The shear develops in the chromosphere and transition region to the corona overlying the photospheric magnetic neutral line separating the delta-spots from the leading polarity at a time when the delta-spots are undergoing rapid growth. Several major flares occur along the sheared portion of the neutral line following the shear development. Other segments of the neutral line far removed from the delta-spots show similar evidence of shear in the H-alpha filament structure and in C IV velocity patterns as well. These 'quiescent' regions of shear are relatively steady or decaying with time and show very little related activity.
Athay Grant R.
Jones Philip H.
Zirin Harold
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