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Title:
The filament eruption in the 3B flare of July 29, 1973 - Onset and magnetic field configuration
Authors:
Moore, R. L.; Labonte, B. J.
Affiliation:
AA(Big Bear Solar Observatory, Pasadena, Calif.), AB(Hale Observatories, Pasadena, Calif.)
Publication:
In: Solar and interplanetary dynamics; Proceedings of the Symposium, Cambridge, Mass., August 27-31, 1979. (A81-27626 11-92) Dordrecht, D. Reidel Publishing Co., 1980, p. 207-210; Discussion, p. 211.
Publication Date:
00/1980
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
CHROMOSPHERE, FILAMENTS, MAGNETIC FIELD CONFIGURATIONS, SOLAR FLARES, SOLAR MAGNETIC FIELD, CORONAL LOOPS, H ALPHA LINE
Comment:
A&AA ID. AAA028.073.077
Bibliographic Code:
1980IAUS...91..207M

Abstract

The filament eruption in the large expanding two-ribbon solar flare which occurred July 29, 1973 is discussed. Observational evidence is presented for the preflare magnetic field configuration, the nature of the filament destabilization and triggering of the flare, and the magnetic field configuration after the filament eruption. The observations show that the filament is under an arcade of closed magnetic field lines prior to the eruption. The eruption of the filament and the onset of the two-ribbon H-alpha flare are preceded by precursor activity in the form of small H-alpha brightenings and mass motion along the neutral line and well below the bottom edge of the filament. The precursor H-alpha brightenings and the first brightenings in the flare ribbons are in the vicinity of the steepest magnetic field gradient in the flare region.

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