Fig. 13.
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Magnetic field extrapolation (potential-field source-surface PFSS) in prominence area before (at 18:04 UT, May 16, 2011 upper panel) and during (at 18:04 UT, May 17, 2011 lower panel) the slow rise process. White curves correspond to the close magnetic field lines, green (purple) lines show the open magnetic field lines with positive (negative) polarity.
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