  Earth's magnetosphere, beyond protecting the ozone layer, is a natural
phenomena which allows to study the interaction between charged particles from
solar activity and electromagnetic fields. In this paper we studied
trajectories of charged particles interacting with a constant dipole magnetic
field as first approach of the Earth's magnetosphere using different initial
conditions. As a result of this interaction there is a formation of well
defined radiation regions by a confinement of charged particles around the
lines of the magnetic field. These regions, called Van Allen radiation belts,
are described by classical electrodynamics and appear naturally in the
numerical modeling done in this work.
