Before It's News | Popular Space
Sun Freaking Out! Massive Coronal Hole July 18
. Info Below Image A vast coronal hole has appeared in the sun's northern hemisphere. NASA's Solar Dynamics Observatory took this picture of the UV-dark chasm on July 18th: Coronal holes are places in the sun's upper atmosphere where the magnetic field opens up and allows solar wind to escape. A broad stream of solar wind flowing from this particular coronal hole should reach Earth on July 19-20.
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