Numerical Study on Finite Amplitude Hydromagnetic Waves in a Model Magnetosphere with the Density Plateau

概要

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Numerical experiments are performed on the finite amplitude HM waves to determine their gross behavior in a model magnetosphere including the density plateau. One dimensional HM equations are integrated with finite difference scheme in which physical dissipation is imitated by the Neumann-Richtmyer's artificial viscosity. The magnetopause is assumed a piston boundary to be movable along radial direction on the equatorial plane. Normal incidence of the generated HM shock into the density plateau is followed with the damped type oscillation of the piston boundary and with the intensification of the strength of the shocks passing through the plateau. From the numerical solutions obtained, it is suggested that oscillatory motion of the magnetopause may be possible, on occasion, by the increase of the solar wind pressure even in a monotonical way, further, this feature may be helpful to suggest a possible means of the energy supply from the sunward to the cavity resonance system of the earth's magnetic field, and magnetic fluctuations after sc pulse may correspond to the successive gain of the influence of the piston. The heating efficiency behind the shock transition is high enough to raise ∿ 1eV particles to those ∿ 100eV of order in a maximum. The reason why this comes will not be clear without quantitative understanding of the collision free dissipation.
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