Magnetogram

Magnetogram

. This magnetogram was taken on 12 February 1989, close to sunspot maximum. Yellow represents positive or north polarity pointing out of the Sun, with red the strongest fields which are around sunspots; blue is negative or south polarity that points into the Sun, with green the strongest. In the northern hemisphere (top half) positive fields lead, in the southern hemisphere (bottom half) the polarities are exactly reversed and the negative fields lead. The Sun rotates east to west so that leading parts of active regions are to the right. [Courtesy of William C. Livingston, National Solar Observatory (NSO), National Optical Astronomy Observatories (NOAO).]

Copyright 2010, Professor Kenneth R. Lang, Tufts University