The effect of the magnetic field stretching on the development of the ring current

While the dipolar solution for the geomagnetic field during quiet times represents a reasonable assumption, during storm activity this assumption becomes invalid. Theoretical and numerical modifications to an inner magnetosphere - Hot Electron Ion Drift Integrator (HEIDI)- model are implemented, in order to accommodate for a non-dipolar arbitrary magnetic field. HEIDI solves the time dependent, gyration and bounced averaged kinetic equation for the phase space density of one or more ring current species. In this study the effect of the magnetic field stretching on the build-up of the ring current is examined for both real and idealized input conditions.