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: