Large-scale activity in solar powerful eruptive events of November 2004 by SOHO/EIT data, . ... Practically in all 9 events of this series, two recurring system of dimmings (regions of a decreased brightening with life-time of the order of 10–15 h ) were observed: (a) trans-equatorial dimmings connecting the north near-equatorial eruptive center with a south active region; (b) north dimmings covering a large sector between two coronal holes. ...