SPECTRAL BROADENING OF VLF TRANSMITTER SIGNALS ON MAGION3 SUBSATELLITE

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Spectral broadening of VLF transmitter signals on Magion-3 subsatellite

Yu.M. Mikhailov, Ya.P. Sobolev and O.V. Kapustina

IZMIRAN, 142190, Troitsk, Moscow region, Russia

Tel. (095)334-09-13, E-mail: [email protected]

Spectral broadening of signals from the ground based Omega navigation system (Aldra) VLF transmitter and JXN transmitter with frequency 16.4 kHz were obtained on the sub satellite Magion-3 (project APEX) on January 9, 1992 during the period 03.15-03.18 UT. Spectra of the signals from both transmitters were similar. This can be explained by propagation of the signals across the same plasma density irregularities. Sometimes spectral broadening was observed during 0.1 s. This corresponds to a scattering region of the order of 10³ m. In the spectra of some signals there was observed an amplitude modulation of signals with period ~0.1 s. We suppose that the spectral broadening of VLF transmitter signals is the consequence of linear wave scattering on plasma density irregularities. Measurements, related with magnetosphere propagation of echo-signals of whistlers and so theoretical estimations show, that whistler mode wave length is equal near 1 km. It agrees with scattering region dimensions, observed in the experiment, that allows suppose existence of ionosphere-magnetosphere interaction on satellite altitudes.

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Tags: broadening of, spectral broadening, subsatellite, signals, spectral, transmitter, broadening, magion3