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We report and analyze the observational evidence of global kink oscillationsin a solar filament as observed in H alpha by National Solar Observatory(NSO)/Global Oscillation Network Group (GONG) instrument. An M1.1-class flarein active region 11692 on 2013 March 15 induced a global kink mode in thefilament lying in the south-west of AR11692.We find periods of about 61 - 67minutes and damping times of 92 - 117 minutes at three vertical slice positionschosen in and around the filament apex. We find that the waves are damped. Fromthe observed global kink mode period and damping time scale using the theory ofresonant absorption we perform prominence seismology. We estimate a lowercut-off value for the inhomogeneity length-scale to be around 0.34 - 0.44 timesthe radius of the filament cross-section.

MHD Seismology of a loop-like filament tube by observed kink waves