The magnetic vector field and the structure of the H-alpha chromosphere of BBR 18,474 on 15 and 16 July 1982

Astronomy and Astrophysics – Astronomy

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Chromosphere, H Alpha Line, Light Scattering, Solar Activity, Solar Magnetic Field, Energy Sources, Solar Flares, Sunspots, Telescopes

Scientific paper

The solar chromosphere in active region BBR 18,474 (July 15-16, 1982) is characterized on the basis of vector magnetograms (in the 525.02-nm line of Fe I) and H-alpha filtergrams obtained at Potsdam using the instruments, techniques and data-reduction procedures described by Bachmann et al. (1975 and 1983) and photoheliograms obtained at Debrecen Observatory. The results are presented graphically and characterized in detail. Transverse magnetic fields of up to 1.4 kG are observed, and the neutral-line filament is found to be located near the minimum field magnitude outside the sunspot group, along the longitudinal-field inversion line inside the sunspot group, and along the direction of the transverse field in the delta area (consistent with strong magnetic-field shear). The flare energy in this active region is attributed to sunspot proper motions.

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