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Portable Network Graphic  |  2003-02-25  |  44.2 KB  |  430x418  |  8-bit (118 colors)
   ocr: SUNSPOTS Sunspots are dark splotches on the Sun caused by the appearance of cooler (4500°C) areas amidst the roiling gases on the surface (6000°C). These areas are cooler because much of their energy is tied up in intense magnetic fields. Physically sunspots are anomalies in the large-scale magnetic field of the Sun. Spots always appear in pairs, like a dipole magnet. The magnetic field strength in a sunspot may exceed the Earth's magnetic field intensity by a factor of 10,000. Sunspots and the active area around them sometimes emit huge amounts of particles and electromagnetic radiation. Espe ...