Quiet aurora band - 6.5.2018 at 00.20 - 6.5.2018 at 02.30 Tampere Observation number 73545

Visibility II / V

Kari A. Kuure, Markku Lintinen, Tampereen Ursa

Probably the last northern lights of spring. The Night Eye Camera at the Ursa Observatory in Tampere recorded the northern lights dimly visible from the clear night sky during the darkest moments of the night. Here are a few screenshots of the brightest moments of repos. The Kp index rose to 6 during the night, so a G2-class magnetic storm caused these fires.

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Additional information

Aurora brightness
- Dim auroras
Colors with unaided eye and other features
- Red coloration of the shapes lower edge
  
  Red lower edge visible with the naked eye. The bands which are starting to level up their activity and are green colored have quite often a narrow red lower edge. This is the most common form of red color which is derived from molecular nitrogen.
  
  Aurora band with purple lower edge. Photo by Ilmo Kemppainen.
  
  The low hanging brightest aurora band is colored red at the lower edge. Photo by Tero Ohranen.
  
  Narrow purple reddish tones at the lower part of this aurora band. Photo by Merja Ruotsalainen.
  
  Purple band at the bottom. Photo by Panu Lahtinen.
- 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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Quiet aurora band - 6.5.2018 at 00.20 - 6.5.2018 at 02.30 Tampere Observation number 73545