Panel a) Hα image at 08:11 UT on 2007 February 6, showing a filament near active region 0940. Panel b) Hinode/SOT Ca ii H image showing that the filament appeared above the western limb as a prominence on February 8. The rectangle indicates a wide slice used for Fig. 3. Panel c) STEREO/EUVI 171 Å image at 17:35 UT on February 8. Panel d) STEREO/EUVI 304 Å image at 17:22 UT on February 8.
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