Filament eruption in the Hα line, on the left, on 26 January 2016 (16:30). The square, indicated by the arrow, indicates the foot where the eruption started at 17:00. The middle and right images represent the horizontal velocity modulus at time 12:00 and 16:00, respectively. For both images, intense donuts are observed close to 12:00 and at the location foot eruption at 16:00. The field of view is 561″ × 572″ (401 × 408 Mm²).