A numerical model for auroral precipitation

Physics

Scientific paper

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Atmospheric Models, Auroral Zones, Electron Precipitation, Electron Beams, Electrostatic Waves, Particle Acceleration, Power Spectra

Scientific paper

A numerical simulation model was developed to investigate the mechanism of auroral precipitation. It is shown that the velocity distribution function of electrons responsible for the discrete aurora depends on two processes. In one, electrons in the region above the ionosphere are accelerated by a dc potential drop that extends from the plasma sheet to the topside ionosphere; in this region the number of particles per unit length in a magnetic flux tube increases with altitude. The second process involves wave-particle interations that occur when the accelerated electron beam encounters the ionospheric plasma. When the plasma density is a function of the coordinates perpendicular to the magnetic field, the upper and the lower hybrid waves are excited and heat the electrons perpendicular to the magnetic field. The upper hybrid waves produce perpendicular heating, leading to large perpendicular gradients in the upward flowing parts of the electron distribution function, which in turn enhance growth rates in auroral kilometric radiation.

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