Relation between the 5.7 yr (dotted and dashed grey curve) and 3.1 yr (dotted grey curve) chromospheric activity cycles, and the polarity reversals in the radial (top row of rectangles) and azimuthal magnetic field (bottom row of rectangles). The red rectangles represent dominant positive polarity magnetic field and the blue rectangles represent dominant negative polarity magnetic field. The transparent rectangles mark epochs when additional opposite polarity magnetic regions are also detected in addition to the dominant polarity.