SEP Acceleration at Realistic CMEs: Two Sites of Acceleration?
Jozsef Kóta, W. B. Manchester, T. I. Gombosi · CERN Document Server (European Organization for Nuclear Research) · 2005
We combine the SEP acceleration and transport code of Arizona with realistic CME simulations from Michigan.We suggest that, in addition to the shock, there is another important site of acceleration: significant particle acceleration can occur in the sheath behind the shock, where magnetic field lines are compressed.Our SEP code considers field-aligned motion of ions, undergoing pitch-angle scattering.We cast the Fokker-Planck equation into a new form, which is suitable to follow the evolution of the magnetic field as the CME expands.Illustrative simulation results are presented.