Massive coronal hole turns earthward- geomagnetic storms may ensue

by Terence Murphy

I picked up this interesting information. It may produce a spectacular show...

CORONAL HOLE: A dark gap in the sun’s atmosphere–a “coronal hole”–is spewing solar wind toward Earth. Estimated time of arrival: July 19th.

This morning, UV-filtered telescopes onboard NASA’s Solar Dynamics Obervatory photographed the opening: Coronal holes are places where the sun’s magnetic field opens up and allows hot gas to escape.

A million mile-per-hour stream of solar wind flowing from this hole could spark polar geomagnetic storms when it arrives early next week. High-latitude sky watchers should be prepared for auroras. –Space Weather


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