Is Carrington event in 1859 really worse than other recent extreme events?

The goal of this study is to try to answer the question: is Carrington event the worst event of all time? First, a state of the art on the 1859 Carrington event will be conducted, including recalling the sequence of events and the various data available. Then the second part will be devoted to the study of magnetic activity during the Carrington event in comparison with other more recent events. A K_Equivalent index was calculated from magnetic data measured by the ground stations during the 1859 events and during other remarkable events in the space age. Moreover a correlation between this K_Equivalent index and the tri-hour index Kp have been done. The result of this study seems to show that Carrington event was really an extreme event but some more recent events are roughly comparable.