Physics
Scientific paper
Apr 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..485r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 40, Apr. 1978, p. 485-489, 491. Research supported by the National Academy
Physics
5
Equatorial Atmosphere, Ionospheric Propagation, Radio Scattering, Spread F, Very High Frequencies, Solar Activity Effects, Vertical Distribution
Scientific paper
Comparing vertical incidence ionograms during spread-F conditions at the equatorial station Huancayo and modified range time intensity records of 50 MHz scatter echoes at Jicamarca, it has been shown that the range type of spread-F is very efficient for the back-scattering of VHF radio waves. On the other hand, the frequency type of spread-F does not seem to produce strong echoes. It is suggested that the range type of spread-F ionogram is due to the reflection of radio waves from large scale irregularities with structure as small as 3 m below or near the base of the F-region. The frequency type spread-F ionogram is suggested to be due to scattering from large-scale irregularities with no 3-m counterpart situated around the region of peak ionization density.
Rastogi R. G.
Woodman Ronald F.
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