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Synoptic map with CHs areas constructed from the EUV images in the channels 19.3 nm obtained by SDO/AIA during the period from 11 February to 9 March, 2014 (CR 2147, time is directed from right to left). The two separate parts of the mid-latitude positive polarity CH1 were observed during 12–18 February (yellowrectangle) and the equatorial negative polarity CH2 – 23–26 February (blue rectangle).
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