In both magnetograms a total of 28 MMFs pairs have been selected. Each pair was reliably defined by two successive magnetograms. We selected only well-isolated MMFs pairs.

Orientation angle is defined as a smallest angle measured in direction from N polarity element to the sunspot radius and is a positive number when the measurement is made in the counter-clockwise direction.

©BBSO/NJIT Seminar on OCT 99, 2000