Effects of amplitude and phase scintillations on decimeter wavelength observations at mid-latitudes

Astronomy and Astrophysics – Astronomy

Scientific paper

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Decimeter Waves, Ionospheric Propagation, Midlatitude Atmosphere, Radio Astronomy, Radio Interferometers, Scintillation, Atmospheric Correction, Calibrating, Phase Error, Radio Wave Refraction, Signal Distortion, Very Long Base Interferometry

Scientific paper

Radio astronomical interferometric observations are affected by atmospheric refraction. They are especially distorted by inhomogeneities in the atmosphere. Inhomogeneities with small spatial dimensions may show up as amplitude and phase scintillations in the observations. These scintillations as observed with the Westerbork Synthesis Radio Telescope (WSRT) at decimeter wavelengths (due to ionospheric inhomogeneities at mid-latitudes) are discussed. They affect instrumental parameters, such as baseline parameters. Comments are given on the implications of these effects on data reduction and imaging. It is shown that self-calibration methods alleviate these problems to some extent.

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