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This article has an erratum: [https://doi.org/10.1051/0004-6361/201220728e]


Fig. 4

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Prediction of the ionospheric Faraday rotation for two different epochs, as viewed from the LOFAR core along the LOS to Cas A. Left: prediction when solar activity is near its minimum. Right: prediction when the solar activity rises toward a new maximum, expected around May 2013. The dashed vertical lines mark the times of sunrise and sunset.

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