Quiet aurora arc - 27.8.2021 at 00.18 Oulu Observation number 100785

Visibility II / V

Sari Pietikäinen, Corona Borealis, Rovaniemi

Oops! My northern lights shooting season started stealthily. On Thursday night, I was driving north from Oulu and somewhere Ii had to stop by the road to shoot when something "northern lights suspicious" flashed in the side window. Well. The pictures revealed that there were clouds then, however. But only a few days later, when I got to the bigger screen, I realized that the pictures taken later that evening on the Oulu side show that there is a dim arc visible. Jeij! Then the storm of Friday night blissfully missed it ...

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Additional information

Aurora brightness
- Can only be seen in photos
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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Quiet aurora arc - 27.8.2021 at 00.18 Oulu Observation number 100785