Some aspects of nonsymmetric ring current dynamics

Contribution of ion-cyclotron instability into formation of asymmetric ring current is analyzed. Resonance interaction of energy protons drifting towards the west with Alfven waves is considered in terms of self-congruent model including plasmasphere heterogeneity. Pitch-angular scattering in waves is shown to result in proton precipitation in ionosphere and in formation of non-symmetric current loop within the evening plasma sphere projection. Comparison of theory conclusions with experimental data including new results about magnetic storm 3-6.09.84 is conducted. The model suggested explains difference of relaxation times for symmetric and asymmetric parts of ring current and localization of asymmetric ring vurrent in the evening sector