Half-sky auroras - 23.2.2020 at 20.30 - 23.2.2020 at 23.30 Muonio Observation number 88547

Visibility IV / V

Olli Selin, Lahden Ursa

My friend and I soon went out to photograph repos on the shores of Lake Särkijärvi. (Figure 1-3) at nine o'clock in the evening.

When I reached the cottage from Särkijärvi, I had to go out again at 11 pm. The reposdelfin came to be photographed. (Figures 4-8).

This description has been automatically translated from Finnish. Click here to see the original text.

6 9

Additional information

Aurora brightness
- Bright 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.
- 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.

Send a comment

Comments are checked and moderated before publication If you want to contact the observer directly about possibilities to use these images, use the Media -form.

Newest observations

Contact information

Half-sky auroras - 23.2.2020 at 20.30 - 23.2.2020 at 23.30 Muonio Observation number 88547