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Ursa Astronomical Association

Quiet aurora arc - 21.1.2023 at 18.47 Kokkola Observation number 111510

Visibility II / V

Tommy Lågland, Ursa (Länsi-Suomi)

The weather has been depressing for a long time. On Saturday, there was an opportunity for a small shooting window before the fog and clouds covered the sky again.

This view assembled from 20s exposures taken as vertical images at 18:46. The view made me think about those rays coming off the arch. Are they suitable for dunes?

In the panoramic scan, which was taken half an hour earlier, they are still not so clear.

Sometimes in the past, witches have come across and appear as such in the long-exposed frames. He easily turns these into clouds, but in this picture they can clearly be connected to that green arch.

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.

    • Rays info

      The raysare parallel to the lines of force of the magnetic field, i.e. quite vertical, usually less than one degree thick light streaks. The rays can occur alone or in connection with other shapes, mainly with arcs and bands. Short rays are usually brightest at the bottom but dim quickly. The longest rays, even extending almost from the horizon to the zenith, are usually uniformly bright and quite calm, and unlike the shorter rays, most often occur in groups of a few rays or alone. Rays, like bands, are a very typical form of aurora.

      Artificial light pillars, which are a halo phenomenon visible in ice mist, can sometimes be very similar to the rays of aurora. Confusion is possible especially when the lamps that cause the artificial light pillars are far away and not visible behind buildings or the forest. The nature of the phenomenon is clear at least from the photographs.

      Rays. Picture of Tom Eklund.

      Rays. Photo by Mika Puurula.

      Two beams rise from the aurora veil. Photo by Anssi Mäntylä.

      Two radial bands. Show Jani Lauanne.

      Radial band and veil. Photo by Jussi Alanenpää.

      Two rays. Photo by Aki Taavitsainen.

      It may be possible to confuse such rays with artificial light columns. Compare the image below. Picture of Tom Eklund.

      There is no aurora in this image, but all the light poles - including the wide and diffuse bar seen at the top left - are artificial light pillars born of ice mist. Photo by Sami Jumppanen.

      Aurora and artificial light pillars. All the radial shapes in the picture above are probably artificial light pillars that coincide appropriately with the aurora band. In the image below, the aurora band has shifted and does not overlap with the pillars produced by the orange bulbs. There is no orange in auroras. Photo by Katariina Roiha

Comments: 2 pcs
Emma Bruus - 22.1.2023 at 13.33 Report this

Todella hieno havainto! Tässä on vaikea tehdä eroa ilmahehkun raitojen ja dyynien välillä. Sama prosessi luo kummatkin. Varovasti kallistuttiin ilmahehkun puolelle noissa ikäänkuin revontuliovaalin ulkopuolisissa raidoissa. Voisi käyttä termiä näyttävä ilmahehku.

Pirjo Koski - 22.1.2023 at 18.26 Report this

Todella komea ilmahehku!! Wau! 

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