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Abstract
The association listing of Coronal mass ejection-Storm Sudden Commencement (CME-SSC) events and impact of CMEs on the ionospheric critical frequency foF2 are the aims of this research. Certain criteria have been put to select the CME-SSC pair events automatically. The travel time of the CME shock could be estimated from an empirical equation that depends on spatial, temporal, CME angular width and projection effect conditions. A high correlation is found according to a certain algorithm between the initial speed and the travel time of the CME shock, R=0.81 with mean arrival time error 16.67 hours for 269 events during the period 1996-2010. Energetic and fast CMEs are more efficient in affecting the ionospheric critical frequency foF2.CMEs of larger width have more probability to hit the earth, increasing ionization in the ionospheric targeted area thus raising foF2 values