A "bizarre" E-shaped aurora was recently photographed dancing in the sky above Alaska. The unusual light show was caused by rare black auroras, a.k.a. anti-auroras, which catapult charged particles from the sun back out of Earth's atmosphere and into space.

Extremely rare, black 'anti-auroras' paint luminous 'letter E' above Alaska

Source: space
Source Link: https://www.space.com/stargazing/aurora-borealis/extremely-rare-black-anti-auroras-paint-luminous-letter-e-above-alaska