Maps of the twist and differential twist angles of magnetic field of the sunspot. Panels a and d: twist of the photospheric field defined as the difference between the azimuth angle of the photospheric field and that of a potential field , . Panels b and e: twist of the field at the chromospheric layers, , where is the azimuth angle of the measured chromospheric field. Panels c and f: differential twist, i.e., the difference between the azimuth angle of the upper chromosphere and that of the photosphere, . Panels in the left and right columns correspond to the observations recorded on 14 November 2010 and 16 November 2010, respectively. Arrows in the panels a and d indicate the direction to disk center. On both days the sunspot is divided in two part denoted as “A” and “B” in panels a and b. Statistics of the twist and differential twist are presented in Fig. 14 and Table 2 for part “A” and “B” and include both parts.
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