Quiet aurora arc - 30.3.2022 at 23.20 - 31.3.2022 at 02.00 Hankasalmi, Murtoinen Observation number 105887

Visibility II / V

Arto Oksanen, Jyväskylän Sirius

There was no predicted northern lights storm. In the images of the Hankasalmi Observatory allsky camera, only a calm arc of northern lights in the northern horizon.

All night timelapse: https://www.youtube.com/watch?v=QTPDlGuXXJM

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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.

Technical information

Alcor System OMEA-1.3M-HCA AllSky camera

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Quiet aurora arc - 30.3.2022 at 23.20 - 31.3.2022 at 02.00 Hankasalmi, Murtoinen Observation number 105887