APOD – A Spiral Aurora over Iceland

Astronomy Picture of the Day
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
2021 September 12 The picture shows a dramatic spiral-shaped aurora over Iceland. Please see the explanation for more detailed information.
A Spiral Aurora over Iceland Image Credit & Copyright: Davide Necchi
Explanation: What’s happened to the sky? Aurora! Captured in 2015, this aurora was noted by Icelanders for its great brightness and quick development. The aurora resulted from a solar storm, with high energy particles bursting out from the Sun and through a crack in Earth’s protective magnetosphere a few days later. Although a spiral pattern can be discerned, creative humans might imagine the complex glow as an atmospheric apparition of any number of common icons. In the foreground of the featured image is the Ölfusá River while the lights illuminate a bridge in Selfoss City. Just beyond the low clouds is a nearly full Moon. The liveliness of the Sun — and likely the resulting auroras on Earth — is slowly increasing as the Sun emerges from a Solar minimum, a historically quiet period in its 11-year cycle.
Tomorrow’s picture: night sky reflected
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