The ionospheric Alfven resonator

Details The ionospheric Alfven resonator The ionospheric Alfven resonator

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jatp...52..781b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 52, Sept. 1990, p. 781-788.

Physics

48

F Region, Ionospheric Disturbances, Magnetohydrodynamic Waves, Plasma-Electromagnetic Interaction, Wave Propagation, Electromagnetic Noise, Geomagnetic Pulsations, Resonant Frequencies, Space Plasmas

Scientific paper

The ionospheric Alfven resonator (IAR) associated with peculiarities of the plasma distribution in the F-region ionosphere affects significantly the spectral form of electromagnetic noise registered on the earth's surface and by satellites. The eigenfrequencies of the IAR are in the range from 0.1 to 10 Hz, and the Q-factor is about 10. This is proved experimentally by the spectral resonance structure (SRS), excited by lightning, which manifests itself as pronounced minima and maxima in the averaged spectral intensity of atmospheric background noise of a few hertz. A theory for the SRS is constructed which explains the main experimental facts. New ground-based diagnostics of the electron density profile above the F-layer maximum derived from SRS data are discussed.

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