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Ursa Astronomical Association

Aurora rays - 27.9.2019 at 22.29 - 27.9.2019 at 22.39 Kouvola Observation number 85899

Visibility II / V

Mika Yrjölä, Ursa (Etelä-Suomi)

I was visiting Kouvola for a weekend village and kept an eye on the sky just in case the northern lights had been promised and the sky was clear contrary to forecasts. In the north direction I did not see the northern lights when I was outside, but the orphaned beam roughly in the northwest direction caught my eye. The tripod was not included, so I improvised a bit and carefully placed the camera on the support post of the Kouvola racetrack fence, when I just reached for it. Unfortunately, Steven apparently missed it.

In hindsight, a certain person could have taken a couple of pictures with the 50mm optics in addition to the ultra-wide one, when one was also included, but it didn't come to mind at that moment for one reason or another.

More similar observations
Additional information
  • Colors with unaided eye and other features
    • White auroras info

      Paljain silmin valkoinen väri näkyy useimmiten himmeissä näytelmissä, kun silmä ei kykene erottamaan mitään varsinaista väriä. Harvoin kirkkaissa näytelmissä valkoinen väri voi myös syntyä sopivista vihreän, punaisen ja sinisen yhdistelmistä.

  • Observed aurora forms
    • STEVE-arc info

      STEVE (Strong Thermal Emission Velocity Enhancement), Pink, radial aurora-like arc  . The STEVE arc is seen clearly separated from the main aurora arc of the northern sky. It forms a long and narrow west-east aligned, usually dim form. It does not belong to traditional auroras as a phenomenon, but may appear same time with them. Occasionally there may also be a green, "toothed" band called ”picket fence” at the bottom of Steve.  

      Riku Talvio, STEVE
      Photo by: Riku Talvio

    • 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

Technical information

Canon 5D mk IV, ISO 800, 5s, Sigma 14mm f / 1.8 @ 1.8 Minor fine-tuning and perspective correction made from raw image conversion with Rawtherape.

Comments: 2 pcs
Panu Lahtinen - 29.9.2019 at 22.49 Report this

Siinähän se on Steve keskellä kuvaa :-)

Mika Yrjölä - 29.9.2019 at 23.27 Report this

Kun tuo oli niin lyhyt tynkä niin luulin ihan tavan säteeksi, mutta en harmistu väärässäolosta. :)

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