Computer Science – Sound
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53..581a&link_type=abstract
(Thermospheric and ionospheric dynamics; Symposium, Exeter, England, July 1989, Selected Papers. A92-10626 01-46) Journal of Atm
Computer Science
Sound
8
Doppler Effect, Earth Magnetosphere, Geomagnetism, Ionospheric Disturbances, Ionospheric Sounding, Magnetohydrodynamic Waves, Extremely Low Frequencies, F Region, Geomagnetic Pulsations, Magnetoacoustic Waves, Wave Reflection
Scientific paper
The results of the experiment conducted in 1987 near Kharkov to develop a technique for the study of the spatial structure of MHD waves at ionospheric heights are discussed. Simultaneous digital Doppler soundings for 6 radiopaths (1-6 MHz) and ULF magnetic recordings were performed. To retrieve the ionospheric signal induced by an MHD wave optimal filtering was applied. The approximately 2nT Pi2 pulsations recorded on the ground correspond to approximately 15 m/s Doppler velocity in the F-layer. Analytical expressions for the ULF-related ionospheric Doppler effect have been derived in the framework of the 'thin' ionosphere. Some modifications are needed to achieve satisfactory quantitative agreement between the present theoretical estimates and experimental results.
Al'Perovich L. S.
Fedorov E. N.
Pilipenko V. A.
Pokhil'Ko S. N.
Volgin A. V.
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