Half-sky auroras - 26.9.2016 at 23.56 - 27.9.2016 at 04.17 Kilpisjärvi Observation number 57372

Visibility IV / V

Erkki Antikainen

Northern lights from a cloud gap in Tundrea's yard.

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6 5

Additional information

Aurora brightness
- Bright auroras
Observed aurora forms
- Corona
  
  CoronaA corona is a hand fan shaped structure, it usually forms south of the observer's zenith, most commonly consisting of rays or bands. The corona is usually the most beautiful part of the aurora show. It is bright and active, but on the other hand also short-lived.
  
  Aurora corona. Photo by Anna-Liisa Sarajärvi.
  
  Aurora corona. Photo by Merja Ruotsalainen.
  
  Corona formed from bands. Photo by Markku Ruonala.
  
  Aurora corona. Photo by Tapio Koski.

Colors with unaided eye and other features
- 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.

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Half-sky auroras - 26.9.2016 at 23.56 - 27.9.2016 at 04.17 Kilpisjärvi Observation number 57372