Abstract
The homologous flares observed in the same region of a spotgroup testify the existence and the duration of a permanent instability. However, they also attest that the general magnetic configuration is not destroyed by these flares and that it changes slowly up to the death of the site. The study of every flaring sites where more than ten flares occur has been performed in Meudon for the 1974–1980 period. One hundred and sixty-six sites have been analysed from the rotation where the A.R. is observed up to five rotations ahead. The basis of the study are the “Synoptic Maps”. A relation is found between the presence of crossing of “filament-phantom” corridors and the location of the homologous flare sites. ∗ ∗ The specific analysis concerning every active regions observed in 1980 and selected for the “homologous flares” study, i.e. A.R. nr. 2363; 2372; 2478; 2466-69-79; 2490; 2507; 2516-17; 2522; 2570; 2629; 2646; were grouped into a composite figure which was presented and explained during the Symposium.
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