The possible production of lower hybrid parametric instabilities by VLF ground transmitters and by natural emissions

Details The possible production of lower hybrid parametric instabilities by VLF ground transmitters and by natural emissions The possible production of lower hybrid parametric instabilities by VLF ground transmitters and by natural emissions

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.2545r&link_type=abstract

Journal of Geophysical Research, vol. 87, Apr. 1, 1982, p. 2545-2548. NSF-sponsored research.

Physics

28

Ground Stations, Ion Acoustic Waves, Ionospheric Propagation, Magnetohydrodynamic Stability, Plasma Waves, Very Low Frequencies, Whistlers, Equatorial Atmosphere, Ionospheric Heating, Propagation Modes, Radio Emission, Radio Transmitters, Thresholds

Scientific paper

A parametric instability at the lower hybrid frequency which is known as the ion quasi-mode instability may be excited in the ionosphere. The instability considered is a three-wave interaction in which an incident whistler mode wave near the lower hybrid frequency decays into a lower hybrid wave and an ion acoustic type of oscillation. Threshold calculations are made at intervals along the L = 4 magnetic field line starting at the earth's surface (the geomagnetic position of Siple Station, Antarctica) and proceeding to the equatorial plane. A model is developed for the ionospheric plasma parameters needed to evaluate the expression for threshold field strength. The fields directly radiated by the Siple transmitter are not strong enough to meet the requirement for threshold. However, it is possible that the threshold can be met for Siple transmissions which are amplified by natural processes and also for natural emissions.

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