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Credit: Solar Dynamics Observatory
Thursday, June 20, 2013: Different images of the sun taken about the same time on June 7, 2013, reveal the underlying magnetic structure of the sun and its appearance above the surface. A magnetic image of the sun contains darker and lighter tones indicating the stronger north and south polarity of active regions. An extreme ultraviolet image shows arcs of magnetic field lines rising out of and returning to the same active regions. Further, scientists illustrate the magnetic field lines, providing a visual lesson in solar magnetism.
http://www.space.com/34-image-day.html