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Collapsing magnetic traps (CMTs) have been suggested as one possiblemechanism responsible for the acceleration of high-energy particles duringsolar flares. An important question regarding the CMT acceleration mechanism iswhich particle orbits escape and which are trapped during the time evolution ofa CMT. While some models predict the escape of the majority of particle orbits,other more sophisticated CMT models show that, in particular, thehighest-energy particles remain trapped at all times. The exact prediction isnot straightforward because both the loss cone angle and the particle orbitpitch angle evolve in time in a CMT. Our aim is to gain a better understandingof the conditions leading to either particle orbit escape or trapping in CMTs.

Loss cone evolution and particle escape in collapsing magnetic trap models in solar flares