Energy Transfer across the Magnetospheric Boundary : A Computer Simulation of the Cross-field Heat Transfer in a Collisionless Plasma

概要

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A computer experiment has been made, simulating the condition of the earth's magnetospheric boundary where an appreciable flow of energy is entering to the magnetosphere from the high temperature domain of the solar wind. One dimensional sheet model being employed, the rate of heat energy flow is computed for the collisionless plasma in which the particles are transported across the static magnetic field. It is shown that the effective transfer rate of heat energy across the magnetic field can attain the value of 10^6 times as large as that estimated by the classical formulae of transport phenomena. An interpretation on the physical mechanism is suggested in terms of the wave-particle interactions in the collisionless regime. It is shown that magnetic turbulences generated at the magnetopause act to destroy the anisotropy of diffusion in such a manner the D_‖ and D_⊥ approach to an effective value D_*∿√<D_‖D_⊥>=υλ_⊥.
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