Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26as..109..355b&link_type=abstract
Astronomy and Astrophysics Suppl. 109, 355-373 (1995)
Astronomy and Astrophysics
Astrophysics
11
Sun: Sunspots, Sun: Flares
Scientific paper
We present the results of a detailed study of evolution of photospheric features, longitudinal magnetic and velocity fields and proper motions of sunspots in one complex (NOAA 6850) and one simple (NOAA 6853) active region of September/October 1991, being part of a long-lasting complex of activity. We bring evidence of the changes of all the studied quantities with the sudden renewal and then subsequent weakening of magnetic activity in the larger group. We discuss the reasons why the complex delta-configuration group did not produced larger flares, assuming that the observed phase of the complex's development represented only a preparatory stage, which matured during the next disk passage. We underline the physical importance of the coincidence of magnetic field, line-of-sight and proper motion singularities with regions of the fastest changes of penumbral and umbral structures.
Bumba Vaclav
Kalman Béla
Klvana Mirek
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