QUASI-ADIABATIC DESCRIPTION OF THE MOTION OF CHARGED-PARTICLES IN CONFIGURATIONS WITH A REVERSED MAGNETIC-FIELD

Within the framework of a perturbation theory, the behavior of charged particles in the Earth's magnetotail under the action of both a nonun iform magnetic field and an electric field is discussed. In the case o f a noticeable curvature of the magnetic field lines, the introduction of adiabatic invariants is justified. The effect of multiple separatr ix crossings on the motion of particles is described.