NOAA forecasters say there is 70% chance of polar geomagnetic storms

This is a “coronal hole” (CH)–a region where the sun’s magnetic field opens up and allows solar wind to escape.  Material is flowing from this coronal hole at speeds exceeding 650 km/s (1.5 million mph).

NOAA forecasters say there is 70% chance of polar geomagnetic storms on Jan. 18th when a fast-moving stream of solar wind hits Earth’s magnetic field. The Arctic light show, however, could begin even earlier.

A co-rotating interaction region (CIR) just in front of the solar wind stream is expected to reach Earth during the late hours of Jan 17th.

CIRs are transition zones between slow- and fast-moving solar wind. They contain density gradients and shock waves that often spark auroras. Free: Aurora Alerts

The incoming stream of solar wind is flowing from a large hole in the sun’s atmosphere. NASA’s Solar Dynamics Observatory photographed the crescent-shaped structure directly facing Earth on Jan. 17th

More on:

http://spaceweather.com

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