Ionospheric refraction effects on radio interferometer phase

Details Ionospheric refraction effects on radio interferometer phase Ionospheric refraction effects on radio interferometer phase

Dec 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987japa....8..281s&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 8, Dec. 1987, p. 281-294.

Astronomy and Astrophysics

Astrophysics

1

Atmospheric Refraction, Ionospheric Propagation, Phase Deviation, Radio Interferometers, Refracted Waves, Atmospheric Models, Optical Correction Procedure, Periodic Variations, Radio Telescopes, Troposphere, Visibility

Scientific paper

Phase variations due to refraction, occurring with particular severity in the Ooty Synthesis Radio Telescope because of its proximity to the magnetic equator, are considered. A simplified slab approximation is shown to inadequately correct for ionospheric refraction effects. Instead, a correction procedure based on the Bent (Bent et al., 1972, 1975) ionospheric model is proposed. The Bent model describes the mean ionosphere in terms of simple biparabolic, exponential layers, and the goal is to keep the total electron content as accurate as possible in order to obtain realiable values of the path length and directional changes of the wave due to refraction.

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