Northern lights have many different shapes and every show is unique.
The most common shapes are diffuse, arc, drapery, rays and corona.
Diffuse usually looks like a grey or green fog in the sky without a specific shape.
A line in the shape of the rainbow called arc is usually on the lower to higher horizon leading from east to west.
Drapery consists of a few or more connected curves.
Rays give us a chance to see Aurora as a group of filaments or streaks.
Corona looks like converging crown overhead usually displaying a variety of colours.
You can see sometimes different shapes at the same time called multiple shapes.
Northern lights can be still and just glow in the sky but if you are lucky you can see it move. It's the time when Aurora is dancing.