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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Auroras seen through breaks in the clouds - 31.10.2021 at 01.37 - 31.10.2021 at 01.45 Korsnäs Observation number 101984

Visibility II / V

Juha Kinnunen, Jyväskylän Sirius

When the value of the Kp index was predicted to be as high as seven - that is, the best for several years - and only partly cloudy clouds and even a clear sky in the morning were forced around Vaasa, we had to try our luck.

Korsnäsin tienoo was finally chosen as the place of observation, where I was on call from nine in the evening to half past four in mild eight-degree weather. As for the repos, however, things didn’t go as I had hoped. Only very rarely did the small-scale thinnings lasting up to a couple of minutes enter the cloud cover, and a large storm of repos, considered almost certain, did not arrive.

After half past two, there was a fairly extensive greenery in the northern sky, barely audible through the gauze, from which these images (01:37, 01:45). However, this little screening was not related to the reported corona mass discharge.

On the way home, I still stopped to check for cloud cover, but as a similar cover it continued all the way home.

The highlight of the night was when a deer appeared to feed on that side of the opening, 50 meters away.



More similar observations
Additional information
  • Aurora brightness
    • Very dim auroras
  • Observed aurora forms
    • Veil info

      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.

  • Colors with unaided eye and other features
    • Green auroras info

      Green, seen with the naked eye, is one the most common colors of the aurora. The green color is derived from atomic oxygen.

      Green auroras. Lea Rahtu-Korpela.

      Green auroras. Photo by Juha Ojanperä.

Technical information

Nikon D800, Nikkor 14mm / f2.8

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