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Ursa Astronomical Association

Quiet aurora arc - 31.1.2022 at 18.45 Ikaalinen, Sisättö Observation number 104410

Visibility II / V

Heidi Rikala, Ursa (Helsinki)

The calm arc of northern lights was indeed calm — nothing really happened.

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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.

Comments: 2 pcs
Eero Karvinen - 6.2.2022 at 22.04 Report this

Aaltomaista kuviointia taivaalla kun katselee, niin voisiko tuossa olla mukana atomaarisen hapen 630 nm emission luomaa ilmahehkua?

Heidi Rikala - 7.2.2022 at 10.38 Report this

Kiitos Eero hyvästä kommentista! Kyllä siinä on ilmahehkua mukana, tein siitä eri havainnon.

Ilmahehkun laadusta minulla ei ole tietoa, en tunne asiaa.

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