- Conference date: 19–23 March 2012
- Location: Palm Springs, CA, USA
It is now widely believed that, in large SEP events, particles are accelerated through the Diffusive Shock Acceleration (DSA) mechanism. In this paper we discuss a few factors that control the maximum energy of particles in large SEP events. Using the NLGC theory, we first examine the effect of shock geometry on the attainable maximum particle energy. The injection energy is assumed to have a simple θ BN dependence. We also discuss the effect of seed population on the acceleration. A recent survey has shown that in a large fraction of large SEP events, there existed preceding CMEs; and in those that no preceding CMEs exist, the maximum intensities correlate with pre-event low energy (of ACE/ULEIS energies) particle intensities at 1 AU. We argue that the seed population is important in these events.
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