Pick of The Week
 
 

The Magnetic Sun (July 17, 2003)


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  • The brighter active regions in the extreme ultraviolet images of the Sun's lower corona correspond to intense magnetic activity as seen in magnetic images of the Sun (called magnetograms, in which the black and white areas indicate north and south polarity). To illustrate this visually we have made a still of the overlay as well as a video of five days this week of activity that moves back and forth between the ultraviolet and the magnetic video frames of the Sun. Note how well the areas of magnetic activity line up with the active regions. Active regions are, in fact, areas of intense magnetic activity that are often the source of solar storms. The "take home" message underlined here is that magnetic activity is the key force that drives changes at all levels and scales in the Sun.

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