Half-sky auroras - 13.9.2014 at 01.00 Sastamala Observation number 30113

Visibility IV / V

Tuukka Järvenpää

Yes, the predictions were true and those repos came here to the south as well. The moonlight and a small mist slightly impaired visibility, but the camera brought out the colors nicely.

This description has been automatically translated from Finnish. Click here to see the original text.

10 12

Additional information

Aurora brightness
- Bright auroras
Colors with unaided eye and other features
- 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.

Observed aurora forms
- ;Veil;Rays;Arc

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Half-sky auroras - 13.9.2014 at 01.00 Sastamala Observation number 30113