There is no doubt that its great to see the Aurora no matter what colours are revealed. If we manage to see the Aurora with our own eyes then we will mostly see it in Black & White. This is because our eyes are made up of cones and rods
The cones reveal detail and colour in good light, in poorer light such as nightime then the rods which are located at the edge of the eye can only give a suggestion of colour mainly green, if we see any at all
Our atmosphere consists of oxygen and nitrogen and these are hit by charged particles blasted out from the sun. As they collide those hitting the Oxygen create a green and red Aurora while those hitting the Nitrogen create a blue or deep red/purple colour
There are many shades of these colours . We normally encounter a green yellow colour while when the Aurora is very active then pillars created can be topped with red. Very occasionally a deep red colour can also be seen at the bottom of the Aurora
The strong green light occurs at around 120 - 180km's while red aurora can be both lower of higher
There is no doubt that a very active Aurora with large rays will be on most peoples bucket list
We are lucky that we can see many different variations in Shetland
To keep up to-date with Aurora activity in Shetland, make a point in joining Shetland Aurora Hunter on facebook
