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Ursa Astronomical Association
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Ursa Astronomical Association

Quiet aurora arc - 10.2.2022 at 21.54 - 10.2.2022 at 22.29 Espoo Observation number 104477

Visibility II / V

Mika Yrjölä, Ursa (Etelä-Suomi)

In the middle of a late dinner, there was a message that northern lights were now visible on the other side of the SME area. I was bored eating out and only then went out with the camera. It would have been worthwhile, however, when on the way there was a glimpse of the arches that had life on a few occasions, but when you reached the seashore, you could no longer see the distressed visible belt, which at times was completely drowned out by light pollution.

However, I was in my passport just in case for half an hour in case I had a better show, but it didn’t go so well. Well, if next time there wouldn’t be as long a break as the last time now that the activity name has already been clearly skipped.

More similar observations
Additional information
  • Aurora brightness
    • Very dim auroras
  • Observed aurora forms
    • Arc info

      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 info

      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.

Technical information

Canon 5D mk IV, Sigma 50mm A, f / 1.8, ISO 400, 5s.

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