Like a bar magnet, the sun has a magnetic north and south pole. The comparison to a simple bar magnet ends there, however, as the sun's magnetic fields are on the move. In fact, approximately every 11 years the polarity of the sun’s northern and southern hemisphere flips. This change is part of a regular cycle called the solar cycle. Each cycle is defined by periods of high and low solar activity caused by the movement of magnetic field lines that extend out from the sun. Now, a new animation created from data collected by the ESA/NASA SOHO spacecraft shows how migrating magnetic field lines result in a reversal of the sun’s polarity. Watch the video to see the evolution of the sun’s magnetic field from January 1997 to December 2013.