Propagation of a quasi electrostatic whistler mode auroral hiss to the ground

概要

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It has been thought from ray tracing studies that quasi electrostatic whistler mode auroral hiss is difficult to propagate down to the ground. To evaluate a refracting capability of VLF waves, we use the equations which were originally given by R. R. SCARABUCCI (1969). The refracting capability becomes gradually large with decreasing altitude in the height range above 2000km, and it becomes very large by a gradient of electron density below 2000km. It is confirmed from ray tracing and the calculation of the refracting capability that the wave normal of a quasi electrostatic whistler mode auroral hiss can enter the transmission cone at the ionospheric altitude when a latitudinally irregular magnetospheric plasma model is adopted, but, such a wave propagation is impossible with a simple diffusive equilibrium (DE) model. As the result, hiss is able to propagate down to the ground under the restricted condition.
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