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We present multiwavelength observations of a large-amplitude oscillation of apolar crown filament on 15 October 2002. The oscillation occurred during theslow rise (about 1 km/s) of the filament. It completed three cycles beforesudden acceleration and eruption. The oscillation and following eruption wereclearly seen in observations recorded by the Extreme-Ultraviolet ImagingTelescope onboard SOHO. The oscillation was seen only in a part of thefilament, and it appears to be a standing oscillation rather than a propagatingwave. The period of oscillation was about two hours and did not changesignificantly during the oscillation. We also identified the oscillation as a"winking filament" in the H-alpha images taken by the Flare MonitoringTelescope, and as a spatial displacement in 17 GHz microwave images fromNobeyama Radio Heliograph (NoRH). The filament oscillation seems to betriggered by magnetic reconnection between a filament barb and nearby emergingmagnetic flux as was evident from the MDI magnetogram observations. No flarewas observed to be associated with the onset of the oscillation. We alsodiscuss possible implications of the oscillation as a diagnostic tool for theeruption mechanisms. We suggest that in the early phase of eruption a part ofthe filament lost its equilibrium first, while the remaining part was still inan equilibrium and oscillated.

Large-Amplitude Oscillation of an Erupting Filament as Seen in EUV, H-alpha and Microwave Observations