Quiet aurora arc - 17.1.2022 at 21.55 - 17.1.2022 at 22.30 Rovaniemi Observation number 104000

Visibility II / V

Sari Pietikäinen, Corona Borealis, Rovaniemi

A cloudless evening enticed us to watch live cameras from the north. At some point, green started to appear in the pictures, so I jumped in the car and headed a little further away from the downtown lights. When I got to the scene, there was a dim arc in the sky. The full moon was blinding, but there were some obvious repos. I described my time, and gave up when the fire was no longer visible to the naked eye. However, the picture taken at 22.30 still shows dim green, so there they remained in the sky ... Slightly dim northern lights, but it was a nice calm and quiet evening with the camera. :)

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Additional information

Aurora brightness
- Dim 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.
- 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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Quiet aurora arc - 17.1.2022 at 21.55 - 17.1.2022 at 22.30 Rovaniemi Observation number 104000