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Detailed analysis of flares, magnetic fields and activity in the sunspot group of Sept. 13-26, 1963

Zirin, Harold and Werner, Susan (1967) Detailed analysis of flares, magnetic fields and activity in the sunspot group of Sept. 13-26, 1963. Solar Physics, 1 (1). pp. 66-100. ISSN 0038-0938.

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We analyze large-scale H-alpha movies of the large spot group of Sept. 13-26, 1963, together with radio, ionospheric and magnetic field data as well as white light pictures. The evolution of the group and associated magnetic fields is followed, and the positions of solar flares relative to the fields are noted, along with their morphology. Although the magnetic field is deformed in time, characteristic field structures may be traced through the deformation as the seat of recurrent homologous flares. We find that most flares are homologous, and some are triggered by disturbances elsewhere in the region. We note events produced by surges falling back to the surface, and one flare initiated by a bright bead seen to fly across the region. In almost every case of an isolated type III radio burst, a corresponding H-alpha brightening could be found, but not all flares produced bursts. Flares close to the sunspots are most likely to produce radio bursts. Flare surface waves in the region all travel out to the west, because of more open magnetic field structure there. In one case (Sept. 25) a wave is turned back by the closed field structure to the east. In almost all cases the time association of radio or ionospheric events is with the beginning of the flare or with the flash phase. Several morphological classes of flares are noted as recurrent types.

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Additional Information:© D. Reidel Publishing Company 1967. (Received 5 August, 1966) We wish to thank many colleagues who have contributed data: Dr. James W. Warwick, for radio data and_valuable discussions; Dr. Vaclav Bumba, for his excellent white light photos; Dr. Neal R. Sheeley for his spectroheliograms; Mr. Harry Ramsey of Lockheed and Mr. Patrick Mcintosh of Sacramento Peak Observatory. Mr. Stephen Schoolman helped with early analysis, and Dr. A. D. Fokker communicated his collected data. This research was begun by us at the High Altitude Observatory and was supported by the National Aeronautics and Space Administration. Above all, we thank the Climax observers, Keith Watson and Robert James for obtaining the movies.
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Subject Keywords:Solar Flare; Radio Burst; Field Structure; Sunspot Group
Issue or Number:1
Record Number:CaltechAUTHORS:20190918-133846911
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Official Citation:Zirin, H. & Werner, S. Sol Phys (1967) 1: 66.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98733
Deposited By: George Porter
Deposited On:19 Sep 2019 14:12
Last Modified:03 Oct 2019 21:43

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