There is a gash floating over the sun’s atmosphere… Although coronal holes are common and appear every few weeks at the surface of the sun, this one is uncommonly long – 700,000 km – and narrow. A fan-shaped spray of gaseous material flowing from the gash could reach our planet as early as Dec. 23rd.

coronal hole, coronal hole december 2017, december 20 2017 coronal hole
700,000 km long coronal hole forms at the surface of the sun. via NASA’s Solar Dynamics Observatory

Arctic sky watchers should be alert for auroras when the solar wind arrives.

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