Magnetogram

A magnetogram is an image of the Sun's magnetic flux. They are derived by using emission lines which are magnetically sensitive, which allows the magnetic flux present to be calculated. Currently, only line-of-sight magnetic flux measurements - the amount of magnetic flux that lies along the line-of-sight between the instrument and Sun - are available on Helioviewer.org, from the HMI and MDI instruments. Magnetograms are important as the Sun's magnetic field is thought to play an important role in solar activity.

In solar-terrestrial terms, solar magnetograms are a graphic representation of solar magnetic field strengths and polarity