Different effects of geomagnetic storm on the FD recovery: a) appearance of FD over-recovery as a consequence of Dst slow recovery (dotted line represents FD as it would look like without geomagnetic activity); b) lack of FD over-recovery due to Dst fast recovery; c) two stages of an over-recovery event, where a different CR and Dst recovery rates result in an over-recovery: commencement of FD and GMS (1) and the recovery stage (2); d) two consecutive ICMEs causing two successive depressions, the second depression showing over-recovery.