Dependence of the Intensity of Solar Energetic Particle Event on the Twin-CME: A Study of Two Cases

Solar energetic particle events often associate with solar flares and Coronal Mass Ejections (CMEs). Because that the interaction of twin-CME is the key factor of solar energetic particle (SEP) events, the relationship between the intensity of SEP event and the associated twin-CME has been investigated for the two SEP events occurred respectively on 15 April 2001 and 20 January 2005, by using the energetic particle strength, flare intensity, and the relative height and time of CMEs observed by the SOHO satellite, as well as the CME speed obtained by fitting the height variation with the time. The results show that the intensities of the two SEP events have no relationship with the associated twin-CME. Hence, in the earlier stage of these two SEP events, the protons of E≥10 MeV are only associated with relevant solar flares and CMEs.