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

Ursa Astronomical Association

Quiet aurora arc - 17.9.2023 at 23.30 - 18.9.2023 at 00.50 Kurikka, Jurva Observation number 118832

Visibility II / V

Timo Nevala, Ursa (Länsi-Suomi)

An event-poor aurora borealis show in the northern sky. It was brighter at first (picture 1), but when I had moved to a slightly more open observation spot, it had already dimmed, and gradually dimmed further. That's all the aurora activities I observed that night have already been listed.

I wanted a little change from these self-repeating green-arc-low-in-the-north pictures by trying to shoot a panorama. But of course those pictures couldn't be seamlessly glued together, optical distortions already prevented that. So I left the seam points quite visible, resulting in a panorama-like picture 2.

In picture 1, there is some kind of satellite flag that I couldn't bring myself to identify.



More similar observations
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.

Technical information

Panasonic Lumix DMC-TZ100

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