Green Aurora over Sweden
It was bright and green and stretched across the sky


A big green arc is seen arching across the night sky. The arc
fades away above into a green haze, while no green glow is seen
below the arc. A dark sky filled with stars and constellations
fills the background. Snow and distant trees line the foreground.
Please see the explanation for more detailed information.
Explanation:
It was bright and green and stretched across the sky.

This striking aurora display was captured in 2016 just outside of
√Ėstersund,
Sweden.

Six photographic fields were merged to create the
featured panorama spanning almost 180 degrees.

Particularly striking aspects of this
aurora
include its sweeping arc-like shape and its stark definition.

Lake
Storsjön
is seen in the foreground, while several familiar constellations and the star
Polaris are visible through the aurora,
far in the background.

Coincidently, the
aurora
appears to
avoid the Moon visible on the lower left.

The aurora appeared a
day after a
large hole
opened in the Sun’s corona,
allowing particularly energetic particles to flow out into the
Solar System.

The green color of the aurora is caused by
oxygen
atoms recombining with ambient
electrons
high in the
Earth’s atmosphere.

Source: https://apod.nasa.gov/apod/ap240522.html

Green Aurora over Sweden