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Ursa Astronomical Association

Half-sky auroras - 19.12.2021 at 20.04 - 19.12.2021 at 21.15 Kuusamo, Käylä Observation number 103223

Visibility IV / V

Jani Päiväniemi, Ursa (Pohjois-Suomi)

Northern lights were visible for a long time. At first I saw an arc from west to east through the zenith which at first I thought was steve but after taking the picture I noticed it was green. Then the arch slipped a bit to live and branched into many arches in the west and a separate arch was still visible in the north. I watched the outlook for a while but the glory of the full moon was hard against the northern lights.

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.

    • 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.

  • 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.

    • Violet auroras info

      Usually in Lapland or even in the south you can see purple auroras in stronger aurora shows. The most common color in auroras along with green and red.

Comments: 5 pcs
Mikko Peussa - 19.12.2021 at 23.40 Report this

Hienot kuvat! Kuu antaa hyvää valoa ja luo tunnelmaa tilanteeseen.

Jani Päiväniemi - 20.12.2021 at 07.43 Report this

Kiitos Mikko! Kyllä kuunvalo on hieno elementti kuvissa ja otsalampusta ei kulu virta kun näkee kulkea yöllä ilmankin:)

Timo Alanko - 20.12.2021 at 09.08 Report this

Enpä ole itsekään moisella kuutamolla tainnut reposia kuvata. Vaasassa olivat kuu ja korona melkein vierekkäin :)

Jani Päiväniemi - 20.12.2021 at 15.36 Report this

Mukava kyllä Timo kun teillä asti näkyi! 

Timo Alanko - 20.12.2021 at 17.30 Report this

Tuohon aikaan oli itse asiassa havaintoasemilla käppyrät korkeammalla meillä täällä etelässä kuin Lapissa :)

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