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In a paper titled Ionospheric Refraction in Radio Astronomy, M. Komesaroff commented that to a first order, refraction in right ascension depends only on changes in total electron content of the ionosphere in an east-west direction (Komesaroff 1960). Excursions in TEC in this direction are principally associated with TIDs. I will show that TIDs are important drivers of ionosphere variability at levels that cause significant Faraday Rotation in low-frequency radio astronomy and therefore, loss of polarisation knowledge of an electromagnetic wave over a variety of timescales ranging from minutes to hours and longer.

Image: David Herne