A strange result in the measurement of the angles of arrival of the first and second echoes from the ionosphere at high radio frequencies

Details A strange result in the measurement of the angles of arrival of the first and second echoes from the ionosphere at high radio frequencies A strange result in the measurement of the angles of arrival of the first and second echoes from the ionosphere at high radio frequencies

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...51..223m&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 51, March 1989, p. 223-231. Research supported by the Aust

Physics

High Frequencies, Ionospheric Propagation, Radar Echoes, Data Reduction, Data Smoothing, Doppler Effect, Ground Effect (Communications), Pattern Recognition, Radar Beams

Scientific paper

Angle-of-arrival measurements were obtained for first echoes (those directly reflected from the ionosphere) and second echoes (those twice reflected from the ionosphere with an intermediate reflection from the ground). Unexpectedly, the off-vertical angle-of-arrival of the second echo was found to be consistently less than that of the first echo for much of the time. It is suggested that rapid phase variations caused by the change in the tilt of the ionosphere prevented recognition of the second echo by the present radar system for echoes reflected from rough terrain.

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