Fig. 2.
Best ROSA images on 2013 January 20: Panel a: G-band image showing the photosphere at 17:21:39 UT, where some restoration artifacts are visible at the borders. Panel b: Ca II K image depicting the upper photosphere and lower chromosphere at 17:21:34 UT. Panel c: Hβ image displaying the chromosphere at 17:21:22 UT. The arrows indicate the direction of solar north and west.
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