

Movement and shape, it’s all about movement and shape!
I must apologise if the title of this missive sounds like a football coach drilling his players about finding space and remaining focussed but movement and shape are key when it comes to the Northern Lights.
Movement and shape. Credit: Antti Pietikainen
The vast majority of Auroras are green, very often myriad shades of green but multi-coloured displays are rare.