More on the smaller active region 09004...

 
    
     fig.17. Cylindrical and semicircular flux tubes, with the field
     lines on the surface. The two poles, of the active region 09004
     are analogous to the two ends of a semicircular flux tube.
         

  •     Clockwise rotation of the poles imparts a
       positive     twist.

  •    The poles P3 and N3 are rotating
        clockwise.
a
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 The Fourteenth Slide