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Ursa Astronomical Association

Quiet aurora arc - 4.1.2015 at 18.40 Kuusamo Observation number 32650

Visibility II / V

Coming from the sauna, I noticed that the starry sky was visible for a long time. And the moon and Zetor + You come. Hopefully it will start to flare up properly.

More similar observations
Additional information
  • Aurora brightness
    • Bright 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.

Comments: 2 pcs
Mikko Peussa - 5.1.2015 at 10.12 Report this

No johan on reposet hienossa paikassa Kuun molemmin puolin. Kehäkin vielä samassa kuvassa :)

Juho Pöllänen - 5.1.2015 at 10.44 Report this

Reposet hipoo upeasti kuun pintaa lähes peilikuvana toisiinsa nähden. Myös kuva Zetorista lämmittää aina :)

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