ИСТИНА

We try to solve the problem of outer radiation belt formation taking into account the latest results on the auroral oval mapping to the equatorial plane. Such mapping was based on the use of pressure as a natural marker, taking into account that in magnetostatic equilibrium the plasma pressure along a magnetic field line is conserved. We compared the results of the study of plasma pressure distribution at the equatorial plane using data of THEMIS mission and at low altitudes using data of DMSP observations and showed that most part of quiet time auroral oval maps to the surrounding the Earth plasma ring. Transverse currents in the plasma ring close inside the magnetosphere forming a high latitude continuation of the ordinary ring current. We obtained pressure distribution during magnetic storms at low latitudes and at the equatorial plane. We produced the nonlinear modelling of magnetic field distortion by obtained pressure profiles in the ring current region, and showed that distortion of magnetic field by the ring current permits to explain many features of the outer radiation belt electron dropouts and acceleration.