Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..900z&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 900-909.
Astronomy and Astrophysics
Astrophysics
50
Solar Flares, Solar Magnetic Field, Sunspots, H Alpha Line
Scientific paper
The present investigation is concerned with an approach which makes it possible to determine the key factors in flare production on the basis of a broad range of observations. The considered observations are related to a study of at least 10 flares in Hale region 17760 between 17:00 UT 1981 July 26 and 18:00 UT 1981 July 27. Attention is given to the optical data and phenomenology of the flares. On the basis of the presented data, it is concluded that flares recurred in a number of areas in the region, each of which was marked by flux emergence. In each area, flaring ceased after flux emergence and spot motion ceased. Flares occur at points where the magnetic field is stressed by changes associated with sunspot evolution, normally flux emergence. Homologous flares in H-alpha reflect the general magnetic layout of the local area in which they occur.
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