Fig. 1
Active region NOAA 11106 with a long Hα filament on September 17, 2010 (BBSO at 16:17 UT) (top panel). The arrows indicate the limit of the different sections of the filament (F1, F2, F3, F4). HMI longitudinal magnetic field at 09:00 UT saturated at +/−100 G (middle panel), Active region and filament channel in 304 Å (AIA) at 08:06 UT (bottom).
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