Fig. 1


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Top: images of the Sun at wavelength 19.3 nm from SDO/AIA for CR 2117, 2118 and 2119 (from left to right on 27 November 2011, 28 December 2011 and 25 January 2012). Bottom: temporal variation of the CH area (in relative units) for three CRs. The abscissa is relative time in hours.

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