The nonlinear gyroresonance interaction between energetic electrons and coherent VLF waves propagating at an arbitrary angle with respect to the earth's magnetic field

Physics

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Geomagnetism, High Energy Electrons, Magnetospheric Instability, Plasma Waves, Plasma-Particle Interactions, Coherent Electromagnetic Radiation, Electron Scattering, Gyrofrequency, Magnetically Trapped Particles, Very Low Frequencies, Wave Propagation

Scientific paper

A theory is presented of the nonlinear gyroresonance interaction that takes place in the magnetosphere between energetic electrons and coherent VLF waves propagating in the whistler mode at an arbitrary angle psi with respect to the earth's magnetic field B-sub-0. Particularly examined is the phase trapping (PT) mechanism believed to be responsible for the generation of VLF emissions. It is concluded that near the magnetic equatorial plane gradients of psi may play a very important part in the PT process for nonducted waves. Predictions of a higher threshold value for PT for nonducted waves generally agree with experimental data concerning VLF emission triggering by nonducted waves.

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