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The white-light films of coronal mass ejections for April -May, 1998 (SOHO LASCO C2, C3), retrieved from Internet, are considered. The positions of active regions on visible and back sides of the Sun for each day are studied. It is shown that a region of large flare can be localized at a distance not less than the solar radius from the place where the transient leaves the solar surface. A perturbation is transferred from the flare to this place within a time not exceeding one minute. Thedoi:10.1051/aas:2000215 fatcat:kkdxqrnomjgr7dzcju5jkvuzuq