Fig. 5
(Top) MDI full disk magnetogram on February 28, 1998, at 00:00 UT (positive/negative magnetic field polarities are indicated in white/black). The five ARs present on the solar disk are indicated with their NOAA numbers. The presence of magnetic tongues with a shape compatible with a positive magnetic helicity sign is evident in AR 8171. (Bottom) LASCO C2 running difference image showing the halo CME at 22:08 UT, together with the closest in time EIT running difference image in 195 Å.
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