Sunspot, Solar Cycle 24, SOHO, 2008
In January 2008, satellite imagery showed the beginnings of Solar Cycle 24. Sunspot activity remained minimal in the months that followed, but at the end of October 2008, another batch of sunspots appeared, most of them belonging to the new cycle. The Michelson Doppler Imager acquired this image of the Sun on November 3, 2008. Two dark sunspots appear in the upper right, along with faculae, bright areas that form around sunspots. While sunspots are actually cooler regions on the Sun's surface, faculae are hot spots that coincide with sunspots. Both phenomena are produced by turbulence in the Sun's magnetic field. Starting on October 31, 2008, five sunspots appeared in quick succession, and progressed across the Sun's surface over the next four days. One of five belonged to Solar Cycle 23. The other four, however, showed characteristics of the emerging Solar Cycle 24. After the appearance of the first sunspot associated with Solar Cycle 24 in January 2008, sunspot activity remained low, as it had for the previous year. The flurry of sunspots starting in late October 2008 suggested the beginning of heightened activity, although sunspot forecasters pointed out that the peak of Solar Cycle 24 was still years away.
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Photo credit: © Photo Researchers / Alamy / Afripics
License: Licensed
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