Comparison on the CME-shock Acceleration of Three Widespread SEPs during Solar Cycle 24

Hong Xie, Catholic University of America, Washington, DC, United States, Pertti Makela, Catholic University of America, Washington DC, United States, O C St Cyr, NASA GSFC, Greenbelt, MD, United States and Nat Gopalswamy, NASA Goddard SFC, Greenbelt, United States