Aurora Proton Arc

By: P-M Heden


Region: Europe

Site: Lapland-Sweden - Sweden

Date: November 2014

A proton arc - a rare type of aurora - appears in an all-sky image (fulldome) made with a fisheye lens. The red arc lasted only a few minutes. Proton arcs are caused not by electrons but by more massive protons that bombard the Earth's atmosphere following an energetic event on the Sun. P-M Heden,

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