Aurora rays - 23.4.2023 at 23.20 - 24.4.2023 at 00.30 Ålsgårde, Tanska Observation number 115607

Visibility II / V

Tine Uffelmann

Northern lights from 22.30-00.30 on 23/24 of april 2023.

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Additional information

Aurora brightness
- Very dim 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.
- Blue auroras
  
  Clearly blue auroras can be seen only during the best aurora displays close to the maximum phase or soon after it. Sometimes blue auroras can be seen shortly after the sunset at the top part of the auroral shapes, specially rays. It is created by the mission of the ionized nitrogen molecules created by the suns radiation.
  
  Strongly colored blue auroras. Photo by Jorma Mäntylä.
  
  Blue top parts of the aurora. Image by Tom Eklund.
  
  Blue top parts of the aurora. Image by Jaakko Hatanpää.
  
  Partly blue corona. Photo by Tapio Koski.
  
  Faintly blue top parts of an aurora veil. Photo by Jaakko Hatanpää.

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Aurora rays - 23.4.2023 at 23.20 - 24.4.2023 at 00.30 Ålsgårde, Tanska Observation number 115607