Preflare activity of solar prominences |
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| Authors: | G Simon N Mein P Mein L Gesztelyi |
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| Institution: | (1) Observatoire de Paris, Département d'Astronomie Solaire et Planétaire (LA 326), F-92195 Meudon Principal Cedex, France;(2) Debrecen Observatory, H-4010 Debrecen, Hungary |
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| Abstract: | The preflare activity of a plage filament is analysed from H observations made with the Multichannel Subtractive Double Pass Spectrograph (MSDP) of the Meudon Solar Tower. The June 22, 1980 event is studied and interpreted in terms of preflare heating of a filament, connected to the rise of emerging flux, and the relative approach of pores of different magnetic polarity, prior to the onset of a two-ribbon flare.The region with enhanced magnetic field, around the filament, begins to brighten slowly 20 min before the triggering of the flare, in the center of H. Filament dark material begins to rise rapidly while the brightest point on one side drifts towards it, 6 min before the onset of the two-ribbon flare. Simultaneously the absorbing material separates from the remaining part of the filament.In the discussion, we suggest that most of the observed features may be the consequence of emergence of new magnetic flux and the related reconnection processes. |
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