Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....84..142m&link_type=abstract
Astronomy and Astrophysics, vol. 84, no. 1-2, Apr. 1980, p. 142-147.
Astronomy and Astrophysics
Astronomy
2
Daytime, Interferometry, Phase Switching Interferometers, Radio Astronomy, Traveling Ionospheric Disturbances, Decametric Waves, Gravity Waves, Mathematical Models, Periodic Variations, Radiant Flux Density, Radiation Measurement, Scintillation, Solar Radio Bursts
Scientific paper
The paper considers the effects of a sinusoidal phase-changing screen on radio-astronomical intensity measurements and interferometry investigated analytically. The model is applied to predict the disturbing effects of an idealized traveling ionospheric disturbance of a 'medium scale'; since the phenomenon is important by daytime, it may disturb solar observations, and should be taken into account in interpreting these observations. For observing wavelengths in the metric range, it produces only slow temporal variations of the apparent source position, while in the decametric range it may produce more rapid intensity variations and modify the apparent source's size, position, and shape.
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