Active aurora band - 10.9.2021 at 22.00 - 10.9.2021 at 23.00 Kuusamo Observation number 101204

Visibility Unclassified

Asko Aikkila

I set out to watch the northern lights at 22 o'clock. The evening was windy and in terms of northern lights it looked quiet. Gradually, momentary warps appeared in the northern sky, and soon they merged into stagnant northern lights. The Northern Lights danced active until 23 and slowly faded pos. They were beautiful, even the color purple was able to see clearly from time to time.

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Additional information

Aurora brightness
- Bright auroras
Colors with unaided eye and other features
- Flaming auroras
  
  Flaming. This rare subclass of aurora does not mean so much a single shape, but a large area in the sky. In the flaming aurora, bright waves that are sweeping upward towards the magnetic zenith emerge in the sky. Very rarely waves can wipe downwards. Bands are usually reported during flaming, less often spots.
- Red coloration of the shapes top
  
  Auroras which have red top part that can be seen with naked eye are most often observed in the bands and long rays. In this case the lower parts are usually green. If the upper parts are in sunlight, red may be stronger than green. This shade of red is due to the discharge of the excitation state of the atomic oxygen.
  
  Aurora that shift to reddish towards the top. Photo by Karri Pasanen.
  
  Red top in a aurora band. Photo by Simo Aikioniemi.
  
  Red at the top of the aurora. Picture of Tom Eklund.
- Green auroras
  
  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.
- Violet auroras
  
  Usually in Lapland or even in the south you can see purple auroras in stronger aurora shows. The most common color in auroras along with green and red.

Technical information

Sony A7S.Samyang 2.8 / 14 mm. Time 3.2 s / sensitivity 2500

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Active aurora band - 10.9.2021 at 22.00 - 10.9.2021 at 23.00 Kuusamo Observation number 101204