Abstract
This paper analyses numerically the data on the large two-ribbon flare of 1996 March 24 obtained at Purple Mountain Observatory. The results show that filament activation plays an important role in the triggering of the flare, that both the emerging flux of opposite polarity and photospheric shearing motion near the filament footpoint are responsible for the filament eruption. The emerging flux causes changes in the background field and the shearing motion which twists the axial magnetic field inside the filament leads to an increase in the electric current, so the filament ceases to be in equilibrium and moves upwards. Lastly, the physical relation between the ascending motion of the filament and the eruption of the flare is analysed and discussed.
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