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Ursa Astronomical Association
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Ursa Astronomical Association

Half-sky auroras - 30.9.2014 at 23.30 Inari Observation number 30745

Visibility IV / V

Teppo Laitinen, Keski-Uudenmaan Altair

The magnificent northern lights filled the sky again and effectively prevented ds filming. This time I saw shapes I haven’t seen before. Directly in the zenith it was as if a colorful snake had slipped back and forth quickly. Too bad at that point, of course, the camera wasn't ready to shoot yet.

More similar observations
Additional information
  • Aurora brightness
    • Very bright auroras
  • Observed aurora forms
    • 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

    • Band info

      Bands are usually narrower, more twisty at the bottom, brighter, and more active than arches. Bands usually develop from arches.

      Bands can form J and U shapes, sometimes even full spirals. The corona can also arise from bands. Bands are a fairly common form of aurora.

      Aurora band. Photo by Merja Ruotsalainen.

      Aurora band. Photo by Matias Takala.

      Aurora band. Photo by Lea Rahtu-Korpela.

      Aurora bands. Photo by Lauri Koivuluoma.

      Aurora band. Photo by Matias Takala.

    • Corona info

      CoronaA corona is a hand fan shaped structure, it usually forms south of the observer's zenith, most commonly consisting of rays or bands. The corona is usually the most beautiful part of the aurora show. It is bright and active, but on the other hand also short-lived.

      Aurora corona. Photo by Anna-Liisa Sarajärvi.

      Aurora corona. Photo by Merja Ruotsalainen.

      Corona formed from bands. Photo by Markku Ruonala.

      Aurora corona. Photo by Tapio Koski.

    • 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

Canon 450D, canon EFS 10-22

Comments: 5 pcs
Merja Ruotsalainen - 1.10.2014 at 05.30 Report this

Komea on näytös ollut! Kateellisena katselin täältä "alempaa" pohjoisen tykitystä

Markku Ruonala - 1.10.2014 at 07.08 Report this

Kyllä, komea on ollut. Vielä enemmän kateellisena ja "alempana" kuin Merja katselin tätä, reposet olivat parhaimmillaankin vain joitain asteita horisontin yläpuolella. Eivät todellakaan häirinneet ds-havaintoja.

Hienoja on, eipä täällä Porin alueella ole mitään vielä näkynyt.. tai sitten en ole ollut tarpeeksi tarkka.

Tero Sipinen - 2.10.2014 at 00.16 Report this

Komeat loimotukset! Kakkoskuva on todella vinkeä!

Teppo Laitinen - 6.10.2014 at 19.38 Report this

Kiitos kommenteista. Nyt kun jouduin palaamaan kotiin etelä-suomeen, tuommoiset reposet on vain mukava muisto. Pakko päästä ennen ensi kesää takaisin pohjoiseen ottamaan lisää kuvia.

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