On the mechanism of formation of field-aligned hot plasma flows in magnetospheric tails

Astronomy and Astrophysics – Astronomy

Scientific paper

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Chaos, Electron Acceleration, High Temperature Plasmas, Magnetic Field Configurations, Magnetohydrodynamic Flow, Planetary Magnetic Fields, Planetary Magnetotails, Astronomical Models, Current Sheets, Dynamic Stability, Scattering, Tearing Modes (Plasmas), Wentzel-Kramer-Brillouin Method

Scientific paper

The effect of acceleration predominance for plasma electrons in a strongly curved tail-like magnetic field near the lower edge of the domain of dynamical chaos is studied. The acceleration is due to stochastic pitch-angle particle scattering resulting in their mean (on the average of bounce period) displacement in the planet-ward direction and due to the action of the electrostatic component of quasi-neutral sheet tearing perturbation. The role of the electromagnetic tearing component is studied. The possibility of restoring the tearing instability and the formation of field-aligned hot plasma flows due to the effect is demonstrated. Its validity for different magnetospheres is discussed.

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