Jan 11

A Hole in the Sun's Corona

Credits: NASA

NASA has released a video of the Solar Dynamics Observatory showing a solar corona hole observed on January 10th, 2011. Coronal holes are areas of the sun's surface that are the source of open magnetic field lines that head way out into space. They are also the source regions of the fast solar wind, which "blows" at a relatively steady clip of about 3 million km/h.(view at NASA)

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