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Fig. 18.

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Evolution of AR 12929 from 16 to 20 of January 2022. (a) Image taken by SDO/AIA_2 211 Å on 2022 January 16 at 19:59:11 UT, showing the accumulated pixels of the dimming areas in the period of time of observation. (b) It shows the CME-driven shock and the EUV wave on January 20 along with the dimming lobes shown in panel a overplotted in red in the position they would have been four days later. (c) the image shown in panel b is de-rotated to the time of panel a using the solar differential rotation formula by Howard et al. (1990). Details given in the main text.

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