Interaction between VLF waves and the turbulent ionosphere

Physics

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Atmospheric Turbulence, Ionospheric Disturbances, Ionospheric Propagation, Vlf Emission Recorders, Whistlers, Field Aligned Currents, Ion Acoustic Waves, Ion Cyclotron Radiation, Plasma Diagnostics, Signal Analysis

Scientific paper

The effects of broadening of frequency spectra of quasi-monochromatic very low frequency (VLF) signals were observed in the polar ionosphere when VLF transmitter signals were registered on the satellite Intercosmos-19. Broadening of the spectrum was mainly registered on the electric antenna to the extent of plus or minus 1 kHz. Broadening of the VLF signal and intensive extra low frequency noise with f less than 1 kHz were observed simultaneously. Such effects can be explained by a transformation of the initial whistler-wave into whistler-mode waves with wave-normals very near the resonant cone, by small-scale ionospheric irregularities. These irregularities can be caused by ion-acoustic or ion-cyclotron waves. The effect of the broadening of the VLF signal spectrum can be used as a diagnostic of ionospheric turbulence and field-aligned electric currents in the upper ionosphere.

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