Further observations of the structure of the D-region using a 1.98 MHz steerable-beam radar

Details Further observations of the structure of the D-region using a 1.98 MHz steerable-beam radar Further observations of the structure of the D-region using a 1.98 MHz steerable-beam radar

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53...89j&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, Jan.-Feb. 1991, p. 89-97. Research supported by Austra

Computer Science

Sound

3

D Region, Ionospheric Sounding, Radar Beams, Radar Measurement, Sidelobe Reduction, Ionospheric Noise, Radar Echoes, Reflected Waves, Wind Profiles, Wind Velocity Measurement

Scientific paper

A powerful MF radar operating at 1.98 MHz has been used to show that in the upper D-region above 80 km the usual echoes have a maximum amplitude at a zenith angle of about 4 deg or less. Below 80 km the echoes are confined to substantially smaller zenith angle than that. This range of zenith angle is less than was previously believed on the basis of analysis of data from this experiment. In addition 'moving cloud' type reflectors are observed, having typically twice the horizontal speed of the background wind.

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