Excitation of Alfvén waves and vortices in the ionospheric Alfvén resonator by modulated powerful radio waves

Details Excitation of Alfvén waves and vortices in the ionospheric Alfvén resonator by modulated powerful radio waves Excitation of Alfvén waves and vortices in the ionospheric Alfvén resonator by modulated powerful radio waves

Mar 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..267t&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 4, p. 267-276.

Physics

11

Scientific paper

A review of the artificial excitation of Alfvén waves and vortices in the ionospheric Alfvén resonator (IAR) is presented. In the framework of simplified models of the IAR and the Alfvén vortex instability, we discuss the main physical phenomena arising under the periodic heating of the ionosphere by a powerful HF radio signal with a modulation frequency F which lies in the range of short-period geomagnetic pulsations (F = 0.1-10 Hz). The amplitudes, frequency spectra, and polarization characteristics of artificial pulsations on the ground are found, and a brief comparison with experimental data is made. The Alfvén vortex instability in the IAR is analysed from the point of view of its artificial triggering. Two ways of such a triggering are discussed. The first suggests the use of two spaced transmitter antenna which produce an ionospheric current being in resonance with Alfvén vortices. Existing heating facilities are suitable for this experiment. The second method is based on the change of macroscopic parameters of the ionosphere, such as the conductivity in the instability region. This method is simple, but requires more powerful heaters.

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