Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977rasc...12..327b&link_type=abstract
Radio Science, vol. 12, Mar.-Apr. 1977, p. 327-336.
Astronomy and Astrophysics
Astronomy
3
Extraterrestrial Radio Waves, F 2 Region, Radio Astronomy, Radio Telescopes, Refracting Telescopes, Antenna Radiation Patterns, Atmospheric Models, Block Diagrams, Chemical Reactions, Ionospheric Composition, Ionospheric Electron Density, Lenses, Plane Waves, Radio Sources (Astronomy), Ray Tracing
Scientific paper
Observations of extraterrestrial radio sources at the lower end of the radio frequency spectrum are limited by reflection of waves from the topside ionosphere and by the large size of antenna apertures necessary for the realization of narrow beamwidths. The use of the ionosphere as a lens is considered. The lens is formed by the release of chemicals such as H2 and H2O at the F2-layer peak. These chemicals promote dissociative recombination of O(+) in the ionosphere resulting in a local reduction in plasma density. Gradients in electron density in the vicinity of the gas release tend to focus rays propagating through the depleted region. Preliminary calculations indicate that a lens capable of focusing cosmic radio waves in the 1 to 10 MHz frequency range may be produced by the release of 100 kg of H2 at the peak of the nighttime F layer. The beamwidth of a refracting radio telescope using this lens may be less than 1/5 degree.
Bernhardt Paul
da Rosa A. V.
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