Moving Magnetic Features (MMFs) are regarded as small magnetic elements which are carried away from the sunspot to the periphery by plasma flows (Vrabec 1971; Harvey and Harvey 1973; Muller and Mena 1987; Brickhouse and LaBonte 1988; Lee 1992).

There are two kinds of MMFs: unipolar and mixed polarity, i.e. bipolar (Harvey and Harvey 1973; Zhang et al. 1992).

©BBSO/NJIT Seminar on OCT 99, 2000