Effects of artificially injected electron beams on the characteristics of ground VLF transmitter signals in the ionosphere

Details Effects of artificially injected electron beams on the characteristics of ground VLF transmitter signals in the ionosphere Effects of artificially injected electron beams on the characteristics of ground VLF transmitter signals in the ionosphere

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jatp...56..423o&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 56, no. 3, p. 423-431

Physics

22

Atmospheric Physics, Atmospheric Scattering, Beam Injection, Earth Ionosphere, Electron Beams, Ionospheric Propagation, Ionospherics, Satellite Transmission, Very Low Frequencies, Whistlers, Amplitudes, Electron Energy, Electron Guns, Graphs (Charts), Intercosmos Satellites, Plasma Density, Plasma Jets, Spectrograms

Scientific paper

Spectral broadening of signals from a ground-based VLF transmitter was observed onboard the Magion-3 sub-satellite during electron beam injection from the Intercosmos-25 (APEX) satellite. Broadening of the order of 300-500 Hz was apparently correlated with the 2 s-periodic sequence of the electron gun pulses which were modulated in amplitude with frequencies 30.5 less than f(sub m) less than 31,250 Hz. No effects were found for those electron gun pulses with f(sub m) = 62.5, 125 and 250 kHz. The observations were made in the middle latitude ionosphere at altitudes between 1175 and 1580 km; the distance between satellite and sub-satellite was about 250 km. The electron gun current and the energy of electrons were 100 mA and 10 keV, respectively, and the duration of the elementary pulse of current was 2 microseconds. The data are interpreted in terms of the scattering of whistler mode waves into quasi-electrostatic waves by periodic small-scale plasma inhomogeneities or ELF plasma turbulence created by the pulse-modulated electron beam in the ionosphere.

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