Coupling between auroral kilometric radiation and auroral radio noise based on wave-particle resonance interaction

Summary The existence of a coupling, due to wave-particle resonance interaction, between magnetospheric radio emissions, i.e. auroral kilometric radiation (AKR), and auroral radio noise(AN), separated in an inhomogeneous magnetospheric plasma by an opacity barrier, is studied. It is proved that the ballistic process can only take place on the electrons of the superthermal component of the plasma, i.e. on particles of auroral electron fluxes of the inverted V type, due to finite width of the AKR spectral lines, which amounts to 1 kHz. Analyses indicate that its effectiveness is sufficient to explain radio emission coupling and that it increases with the degree of auroral activity.

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