Half-sky auroras - 26.1.2023 at 22.44 Itämeren yllä Observation number 112465

Visibility IV / V

Harri Heikkilä

Upon reaching Helsinki-Vantaa, the northern lights photographed from a height of approx. 35,000 ft above the Baltic Sea.

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Additional information

Aurora brightness
- Very bright auroras
Observed aurora forms
- Band
  
  Bands are usually narrower, more twisty at the bottom, brighter, and more active than arches. Bands usually develop from arches.
  
  Bands can form J and U shapes, sometimes even full spirals. The corona can also arise from bands. Bands are a fairly common form of aurora.
  
  Aurora band. Photo by Merja Ruotsalainen.
  
  Aurora band. Photo by Matias Takala.
  
  Aurora band. Photo by Lea Rahtu-Korpela.
  
  Aurora bands. Photo by Lauri Koivuluoma.
  
  Aurora band. Photo by Matias Takala.

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 - 26.1.2023 at 22.44 Itämeren yllä Observation number 112465