NASA’s Solar Dynamics Observatory (SDO) is monitoring a hole in the sun’s atmosphere–a “coronal hole.”

sun_hole

It is colored deep-blue in this extreme UV image of the sun taken by SDO on Aug. 26th

CLICK HERE ON LINK TO SEE FULL IMAGE AND ZOOM ON IT

http://www.spaceweather.com/images2015/26aug15/ch.jpg?PHPSESSID=ajitmknl5666rvrf1cpbab5ia4

Coronal holes are places where the sun’s magnetic field opens up and allows solar wind to escape. In the image, above, the sun’s magnetic field is traced by pale loops. White arrows show the flow of material out of the hole.

A stream of solar wind flowing from this coronal hole will probably reach Earth on Aug. 28-29. Its impact could spark a geomagnetic storm at the end of this week. If so, bright moonlight will temper the visibility of any auroras. Aurora alerts: text or voice

http://www.spaceweather.com/

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