Long-decay soft X-ray flares. IV - Contact arcade 1B/X3 LDE flare 1982 June 4, 13:13 UT

Details Long-decay soft X-ray flares. IV - Contact arcade 1B/X3 LDE flare 1982 June 4, 13:13 UT Long-decay soft X-ray flares. IV - Contact arcade 1B/X3 LDE flare 1982 June 4, 13:13 UT

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991baicz..42...31o&link_type=abstract

Astronomical Institutes of Czechoslovakia, Bulletin (ISSN 0004-6248), vol. 42, Feb. 1991, p. 31-38.

Astronomy and Astrophysics

Astronomy

1

H Alpha Line, Solar Flares, Solar X-Rays, Coronal Loops, Solar Prominences, Sunspots, Temporal Distribution, X Ray Spectra

Scientific paper

The H-alpha morphology of the June 4, 1982, 13:13 UT, 1B/X3 LDE flare was analyzed from early onset through the maximum to the declining phase of the flare. The flare has been classified as a C-type flare, but an A-type hot component is also present. In the course of the LDE flare, three dipolar arcades bridging H-alpha ribbons were observed to originate. The main arcade, Arc 1, was connected with an erupted penumbral filament pF2 and was above spots A and B, forming a delta configuration. The origination of Arc 3 and the intermittent Arc 2 are not related to the erupted filament. All three arcades displayed a common negative ribbon S 1. The contact ribbon S 1 ran along the neutral line in the center of the delta configuration. A similar contact of two different flare loops in a common ribbon has been observed in several SMY flares. Therefore, a contact ribbon common to several flare arcades may be a general symptom of the development of extended flares.

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