Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...120..313s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 120, no. 2, April 1983, p. 313-321.
Astronomy and Astrophysics
Astronomy
17
Atmospheric Effects, Interferometry, Ionospheric Propagation, Radio Astronomy, Radio Wave Refraction, Correction, Faraday Effect, Ionospheric Electron Density, Radio Sources (Astronomy)
Scientific paper
A correction procedure for ionospheric refraction in radio astronomy interferometry is outlined in the present paper. This correction is applied to observations made with the Westerbork Synthesis Radio Telescope and its results are discussed. It turns out that a correction for a combination of both horizontal and vertical gradients in the electron density distribution can improve the observations considerably. It is shown that this approach gives better results than would be derived by taking into account the horizontal structure of the ionosphere only. The available ionospheric data based on ionosonde observations limit the applications significantly. At present the corrections can only be determined each full hour. Furthermore, since the information about the ionosphere is determined from ionosonde date it is not possible to derive reliable corrections around sunrise, when rapid changes in the vertical electron density distribution occur.
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