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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Quiet aurora arc - 12.10.2022 at 22.25 - 12.10.2022 at 23.40 Ulvila Observation number 109988

Visibility II / V

Juha Ojanperä, Porin Karhunvartijat

A modest, calm aurora borealis appeared low on the northern horizon on the night of 12/13/10/2022.



More similar observations
Additional information
  • Aurora brightness
    • Very 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.

Comments: 2 pcs
Jarkko Suominen - 14.10.2022 at 13.06 Report this

Viljolla on selkeästi ollut nyt joku kaveri nauttimasssa revontulista.

Juha Ojanperä - 17.10.2022 at 09.26 Report this

Joo niin näkyy olevan kaksi kahdeksanjalkaista kamerassa :D

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