Half-sky auroras - 25.1.2022 at 20.20 - 25.1.2022 at 23.03 Karigasniemi Observation number 104298

Visibility IV / V

Tarja Kouvo

The fires of that night were wide, seeming to be between and to come everywhere. Also from the south. Were extensive but slow-moving. The situation in the appendix was interesting to me, the tentacles seemed to condense and shone strong. Similar phenomena later came from the south. Pearls were also seen on the same day, so the whole day was staring at the sky.

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Additional information

Aurora brightness
- Bright auroras
Observed aurora forms
- Arc
  
  ARC The arcs are wider than the bands and do not fold as strongly. The arcs are normally neither very bright nor active.
  
  The arc is probably the most common form of aurora. When aurora show is a calm arc in the low northern sky it often doesn’t evolve to anything more during night. In more active shows the arc is often the first form to appear and the last to disappear.
  
  The lower edge of the arc is usually sharp but the upper edge can gradually blend into the background sky. As activity increases rays and folds normally develop, and the arcs turn gradually into bands.
  
  An aurora arc runs across the picture. Vertical shapes are rays. Photo by Atacan Ergin.
  
  Aurora Arc. Photo by Mauri Korpi.
  
  Aurora Arc. Photo by Anna-Liisa Sarajärvi.
  
  Aurora Arc. Photo by Matti Asumalahti.

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Half-sky auroras - 25.1.2022 at 20.20 - 25.1.2022 at 23.03 Karigasniemi Observation number 104298