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Ursa Astronomical Association

Quiet aurora arc - 10.9.2015 at 22.30 Valkeakoski, Sääksmäki Observation number 42356

Visibility II / V

Finally a bright night, so there was no need to guess what was going on behind the clouds.

The arc was not very bright at first, but for a while it did activate and reposet jumped along the sky from time to time. Finally calmed down again until it began to fade at half past two.

Unfortunately, the brightness was still not enough for my pocket, even though I tested the shooting tips I received, thanks for them. Pentti, this Panasonic offers ISO only up to 1600. The only exposure time that showed something was 1 sec. who made a truly hazy imprint, as the picture shows. The best option tonight was the 30 sec starry sky setting, because even 15 sec was not enough). I wonder if you should ask the buck rational ... Maybe I'll just admire the stunning shots of your others when you don't have the skills.

However, I will now record an observation when there do not appear to be any others here.

More similar observations
Additional information
  • Aurora brightness
    • 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.

  • Colors with unaided eye and other features
    • Green auroras info

      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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