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On 2005 September 13 a filament eruption accompanied by a halo CME occurredin the most flare-productive active region NOAA 10808 in Solar Cycle 23. Usingmulti-wavelength observations before the filament eruption on Sep. 13th, weinvestigate the processes leading to the catastrophic eruption. We find thatthe filament slowly ascended at a speed of 0.1km/s over two days before theeruption. During slow ascending, many small flares were observed close to thefootpoints of the filament, where new magnetic elements were emerging. On thebasis of the observational facts we discuss the triggering mechanism leading tothe filament eruption. We suggest the process toward the eruption as follows:First, a series of small flares played a role in changing the topology of theloops overlying the filament. Second, the small flares gradually changed theequilibrium state of the filament and caused the filament to ascend slowly overtwo days. Finally, a C2.9 flare that occurred when the filament was close tothe critical point for loss of equilibrium directly led to the catastrophicfilament eruption right after itself.

Triggering Mechanism for the Filament Eruption on 2005 September 13 in Active Region NOAA 10808