A bounce-averaged ring current kinetic model for arbitrary pitch angle
, including losses due to charge exchange and Coulomb collisions along
ion drift paths, is developed and solved numerically. Results from si
mplified model runs, intended to illustrate the effects of adiabatic d
rifts and collisional losses on the proton population, are presented.
The processes of i) particle acceleration under the conditions of time
-independent magnetospheric electric fields; ii) a predominant loss of
particles with small pitch angles due to charge exchange; and iii) a
buildup of a low-energy population caused by the Coulomb drag energy d
egradation, are discussed.