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

Ursa Astronomical Association

Half-sky auroras - 13.9.2014 at 01.00 Enontekiö Observation number 30087

Visibility IV / V


Northern lights came out as the cloud cover retreated.



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Additional information
  • Observed aurora forms
    • Veil info

      Veil
      Veil is the most bland and very common form of aurora. It usually covers its homogeneous dim glow over a wide area of the sky at once. Most often, the veil is seen in the calmer and quiet phase of the night after the aurora maximum as a background for other forms. The veil can also occur alone and in that case it will be quite difficult to reliably identify as an aurora, especially at a observation site which has a lot of light pollution.

      A similar glow of light can also be caused by airborne moisture, smoke, or a very thin layer of clouds that reflects the light that hits them. However, clouds can also be used to identify veil, especially if the middle or upper cloud appears dark against a lighter background, then it is very likely to be aurora veil if the brightness of the background sky is not due to the rising or falling Moon or Sun. When photographing, very long exposure times usually reveal the green colour of the veil auroras.

      Veil and rays. Photo by Esa Palmi.
       

      Red aurora veil. Photo by Marko Mikkilä.

       

      Veil. Photo by Milla Myllymaa.

       

      Aurora veil that changes color from green at the lower edge through purple to blue at the top. Photo by Jaakko Hatanpää.

       

      Dim green veil. Photo by Jarmo Leskinen.

       

      Radial aurora band surrounded by veil. Photo by Jussi Alanenpää.

    • 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: 5 pcs
Janne Kari - 13.9.2014 at 03.02 Report this

Meillä etelässä oli ihan kivaa repostelua, mutta onpas teillä pohjoisessa ollut taas todella komeaa.

Hienoa jälkeä.

Merja Ruotsalainen - 13.9.2014 at 06.26 Report this

Reposet on komeita, mutta kun siihen listätään vielä nämä maisemat, niin olen sanaton....

Sami Simanen - 13.9.2014 at 10.50 Report this

Wow!

Vaikuttavat ovat oleet ja kuvat ovat.

Lauri Kumpulainen - 13.9.2014 at 11.23 Report this

Jos tuolla napapiirin pohjoispuolella olisi töitä, niin en kyllä aikailisi muuttoa sinne. Kyllä olisi makeaa seurata tälläistä näytöstä oman hirsitönön takapihalta.

Markku Ruonala - 13.9.2014 at 13.41 Report this

Komeita revontulikuvia upeissa Lapin maisemissa. Komeita kuvia myös muiltakin viime yön hienosta revontulinäytelmästä. On mukava saada jakaa kokemuksia Taivaanvahdin kautta.

Toivaataan lisää kokemusten jakoa ensi yöltä.

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