Physics
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jatp...53...53j&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 53, Jan.-Feb. 1991, p. 53-62. DOE-sponsored research.
Physics
8
Annual Variations, Doppler Effect, F Region, Ionospheric Propagation, Traveling Ionospheric Disturbances, Acoustic Instability, Propagation Modes, Propagation Velocity
Scientific paper
The apparent undulatory motion of the ionospheric HF reflecting surface is studied using a method based on the relationship between angle-of-arrival and Doppler. The conditions are midlatitude, daytime, F-region, winter/spring/summer. Multiple traveling ionospheric disturbances are active simultaneously, so that the HF Doppler evolves in a highly irregular and nonsinusoidal manner. The influence of this multiple-wave overlap on the apparent propagation velocity measured quasi-instantaneously is studied. The apparent propagation velocity retains the key features observed by others, namely dominant propagation toward the E/SE, and virtually no propagation toward the W/NW. However, the apparent instantaneous velocity varies widely in both magnitude and azimuth over times as short as 500 s. This is explained in terms of multiple-wave overlap.
Carlos Robert C.
Jacobson Abram R.
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