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Astronomy.FM Skylog: Brilliant Illuminations

Coronal Holes

29 Jun 2011, 02:50 UTC
Coronal Holes
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Coronal holes are areas where the Sun's corona is darker, colder, and has lower-density plasma than average. Coronal holes are linked to unipolar concentrations of open magnetic field lines. During solar minimum, coronal holes are mainly found at the Sun's polar regions, but they can be located anywhere on the sun during Solar Maximum. The fast-moving component of the solar wind is known to travel along open magnetic field lines that pass through coronal holes. A solar wind
stream flowing from the indicated coronal hole in this photograph taken June 28, 2011 should
reach Earth on ~July 2nd.. Credit: SDO/AIA

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