The role of protons of the radiation belts in the generation of Pc 3-5

Computer Science

Scientific paper

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Earth Magnetosphere, Magnetohydrodynamic Waves, Plasma-Particle Interactions, Proton Energy, Radiation Belts, Wave Generation, Cyclotron Resonance, Geomagnetism, Magnetospheric Instability, Nonuniform Plasmas

Scientific paper

Alfven-wave generation in an inhomogeneous two-component finite-beta plasma is investigated for both the long-wave approximation and the range where the growth rate attains its maximum value. The qualitative theory of the drift instability in the magnetospheric plasma is reviewed, and the analysis is conducted on the assumption that the geomagnetic field lines are straight. The effect of the loss cone on the development of the drift instability is considered. The results are applied to explain the generation mechanism of Pc 3-5 oscillations. It is noted that the conclusions can be applied to the problem of Alfven-wave generation in the magnetospheric plasma because the properties of the outer-radiation-belt plasma are similar to those considered in the present analysis.

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