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We present a detailed study of the formation of an inverse S-shaped filamentprior to its eruption in active region NOAA 11884 from October 31 to November2, 2013. In the initial stage, clockwise rotation of a small positive sunspotaround the main negative trailing sunspot formed a curved filament. Then thesmall sunspot cancelled with negative magnetic flux to create a longeractive-region filament with an inverse S-shape. At the cancellation site abrightening was observed in UV and EUV images and bright material wastransferred to the filament. Later the filament erupted after cancellation oftwo opposite polarities under the upper part of the filament. Nonlinearforce-free field (NLFFF) extrapolation of vector photospheric fields suggeststhat the filament may have a twisted structure, but this cannot be confirmedfrom the current observations.

The formation of an inverse S-shaped active-region filament driven by sunspot motion and magnetic reconnection