Sounding of the lower ionosphere using artificial periodic irregularities

Details Sounding of the lower ionosphere using artificial periodic irregularities Sounding of the lower ionosphere using artificial periodic irregularities

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991ge%26ae..31..743r&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 31, July-Aug. 1991, p. 743-746. In Russian.

Computer Science

Sound

Annual Variations, Ionospheric Electron Density, Ionospheric Propagation, Ionospheric Sounding, Nonuniform Plasmas, Gravity Waves, Lower Ionosphere, Relaxation Time, Sound Waves, Terminator Lines

Scientific paper

Several cycles of the relaxation-time measurement of artificial periodic irregularities in the lower ionosphere were performed in the Dushanbe region (39 deg N) in the autumn of 1988 and in the winter and spring of 1989. Seasonal variations of the relaxation times were found: at heights of 90-110 km the spring values were greater than the winter ones. In addition, short-term variations of the relaxation time with periods of 5-15 m were found, which were evidently due to the excitation of acoustic-gravity waves near the terminator.

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