Pick of The Week

Magnetic activity and active regions (September 17, 2001)

Higher resolution version (TIF,2.4M)
Sun in ultraviolet light (left) that shows active regions (brightest white) compared to a magnetic image on the same day (right) reveals a close correlation. The black and white areas indicate north and south polarity. Active regions are areas of intense magnetic activity that are often the sources of solar storms.

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