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

Ursa Astronomical Association

Quiet aurora arc - 7.2.2021 at 21.55 - 7.2.2021 at 22.30 Rovaniemi Observation number 95939

Visibility II / V

Sari Pietikäinen, Corona Borealis, Rovaniemi

For a long time a cloudless sky! We set off with a guy with a camera and a telescope with us to see what all the sky had to offer us. The place we chose turned out to be unnecessarily light polluted, but we didn’t let it interfere. Even small northern lights appeared immediately to our delight. Mostly they were so dim that they were only visible on the camera, but at times something was visible even to the naked eye. At 23 o'clock the clouds rolled on and we fled the scene. During the evening, more bongas came to the challenge again ...

#bongaa100



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.

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