Fig. 1
Active region AR 11850 observed on September 24, 2013 from left to right: full disk image in AIA 304 Å, the white box indicates the field of view of the two right panels (140 × 175 arcsec2), Hα image (MSDP/Meudon spectrograph) and Mg II k line centre at 2803.5 Å obtained between 11:43 and 12:04 UT (IRIS spectrograph) showing the arch filament system (AFS). The two white boxes in the IRIS panel represent the field of view of the two small rasters presented in Figs. 3 and 4.
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