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In this work, non-recurrent Forbush decreases (FDs) triggered by the passageof shock-driven interplanetary coronal mass ejections (ICMEs) have beenanalyzed. Fifty-nine ICMEs have been studied but only the 25% of them wereassociated to a FD. We find that shock-driving magnetic clouds (MCs) producedeeper FDs than shock-driving ejecta. This fact can be explained regarding tothe observed growing trends between decreases in neutron monitor (NM) countrate and MC/ejecta speed and its associated rigidity. MCs are faster and havehigher associated rigidities than ejecta. Also the deceleration of ICMEs seemsto be a cause in producing FDs as can be inferred from the decreasing trendbetween NM count rate and deceleration. This probably implies that theinteraction between the ICME traveling from the corona to the Earth and thesolar wind can play an important role to produce deeper FDs. Finally, weconclude that ejecta without flux rope topology are the less effective inunchaining FDs.

Observable effects of Interplanetary Coronal Mass Ejections on ground level neutron monitor counting rates