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De-distorting ionospheric effects in the image plane

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arxiv 1808.08017 v1 pith:MVDWDH5B submitted 2018-08-24 astro-ph.IM

N. Hurley-Walker , P. J. Hancock This is my paper · ORCID
classification astro-ph.IM
keywords methodhttpsimageionosphereionosphericpositionsradioshifts
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The Earth's ionosphere refracts radio waves incident on an interferometer, resulting in shifts to the measured positions of radio sources. We present a method to smoothly remove these shifts and restore sources to their reference positions, in both the catalogue and image domains. The method is applicable to instruments and ionospheric weather such that all antennas see the same ionosphere. The method is generalisable to repairing any sparsely-sampled vector field distortion to some input data. The code is available under the Academic Free License (https://opensource.org/licenses/AFL-3.0) from https://github.com/nhurleywalker/fits_warp

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