A study of the relationship between solar energetic particles and EUV waves

We studied 12 solar energetic particle (SEP) events accompanied by Extreme ultraviolet (EUV) waves. All SEP events were detected by more than two spacecraft among STEREO-A, B and Earth (ACE/SOHO/GOES) between 2010 August and 2012 January. The events were associated with flares (C1 to X6) and fast coronal mass ejections (CMEs). We have determined the arrival times of the SEPs at the three positions. EUV waves, observed in the 195Å and 193Å of STEREO and SDO, are tracked across the Sun to determine their arrival time at the photospheric source of open field lines connecting to the spacecraft. There is a good correlation between the EUV wave arrival times at the connecting footpoints and the SEP onset times. The delay time between electron onset and the EUV wave reaching the connecting footpoint is independent of distance from the flare site. The proton delay time increases with distance from the flare site. It is interesting to note that the EUV wave speeds are correlated with the SEP peak fluxes.