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Skywarden,
Ursa Astronomical Association
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00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Quiet aurora arc - 18.2.2018 at 20.15 - 18.2.2018 at 20.45 Rovaniemi Observation number 70669

Visibility II / V

Sari Pietikäinen, Corona Borealis, Rovaniemi

Northern lights forecasts looked promising today, so I set out in search of a cloudless sky around Rovaniemi. At the end of an hour and a half of driving, I found the sky, and then I just had to wait. It was close to 20 degrees below zero in Olkkajärvi, and fortunately a little greenery started to appear in the camera after waiting a quarter, ie around 20.15. This photo is the last one I took, at 8:46 p.m. Then I had to give up and go warm. A group of tourists remained to admire the fire ...



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.

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