Diffuse glow - 4.12.2017 at 21.41 Jämsä Observation number 68591

Visibility I / V

Eila Tiirinen

For me, a really bad northern lights autumn. It has always been cloudy when there was an opportunity to see the northern lights. In the evening I went on a yacht and thought to wait even longer in the hope of pictures. But it happened differently. The cloud cover spread very quickly across the sky. In this first "test picture", however, something green was visible. Then I photographed the perimeter of the moon, and finally the moon was covered in clouds.

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Additional information

Aurora brightness
- Can only be seen in photos
Observed aurora forms
- Veil
  
  Veil
  Veil is the most bland and very common form of aurora. It usually covers its homogeneous dim glow over a wide area of the sky at once. Most often, the veil is seen in the calmer and quiet phase of the night after the aurora maximum as a background for other forms. The veil can also occur alone and in that case it will be quite difficult to reliably identify as an aurora, especially at a observation site which has a lot of light pollution.
  
  A similar glow of light can also be caused by airborne moisture, smoke, or a very thin layer of clouds that reflects the light that hits them. However, clouds can also be used to identify veil, especially if the middle or upper cloud appears dark against a lighter background, then it is very likely to be aurora veil if the brightness of the background sky is not due to the rising or falling Moon or Sun. When photographing, very long exposure times usually reveal the green colour of the veil auroras.
  
  Veil and rays. Photo by Esa Palmi.
  
  Red aurora veil. Photo by Marko Mikkilä.
  
  Veil. Photo by Milla Myllymaa.
  
  Aurora veil that changes color from green at the lower edge through purple to blue at the top. Photo by Jaakko Hatanpää.
  
  Dim green veil. Photo by Jarmo Leskinen.
  
  Radial aurora band surrounded by veil. Photo by Jussi Alanenpää.

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Diffuse glow - 4.12.2017 at 21.41 Jämsä Observation number 68591