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The AstronomersNASA SDO - Growing Sunspot
NASA SDO - Growing Sunspot
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The video from the Helioseismic and Magnetic Imager onboard SDO shows the Active Region 1393 from January 6 through January 8 and demonstrates how sunspots can quickly change shape and size. Sunspots are planet-sized magnets created by the Sun's inner magnetic dynamo. Like all magnets in the Universe, sunspots have north (N) and south (S) magnetic poles Sunspots, temporary disturbances in the Sun's photosphere, are the most visible advertisement of the solar magnetic field. They appear dark because temperatures are considerably lower than in surrounding areas. Sunspots occur where the magnetic field lines emerge from the inside of the Sun to form expanding loops above its surface. Sunspots usually show up as small forms that are irregularly shaped, and grow within days or weeks to their full size. While they can last weeks or months, they do eventually disappear, often by breaking into smaller and smaller sunspots. Credit: NASA SDO
Added on Apr 2, 2012 by deek
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Time: 00:25 | Views: 779 | Comments: 0
  NASA  SDO  Solar  Dynamics  observatory  HMI  AIA  EVE  Sun  sunspot  magnetic  field  astronomy  space 
  Solar astronomy  
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