Aurora colors – Eye and camera

Move the white divider to the left and right to see the difference.

1. Common, the green color is visible to our eye, but red-purple is nearly without color:

2. When the red color high up becomes visible, the eye can see the color pretty well. Usually then is will be there for quite a while.:

3. Seldom, during a strong geomagnetic storm, nearly all colors were visible: