Acceleration of charged particle fluxes by turbulent electrostatic solitary structures in auroral plasma Original Research Article

A turbulent acceleration of charged particle fluxes near a substantial magnetic field-aligned electric current is considered. Conditions in the auroral magnetosphere are known to be favourable for an excitation of plasma turbulence in a form of oscillating solitary electrostatic structures. The model of turbulent structures and its statistics is selected to be confirmed with known results of experimental observation and numerical calculations. The solution of stationary kinetic equation for particle fluxes in turbulent nonuniform layer is obtained. It is shown that electron fluxes accelerated by turbulent electrostatic structures move almost along the magnetic field while ion distributions have considerable perpendicular dispersion. Conditions of a formation of particle beams with selected energies are determined. Obtained theoretical results are in a qualitative agreement with the known experimental observations of particle fluxes up to energies of several keV in the disturbed auroral magnetosphere.