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Ursa Astronomical Association

All-sky aurora - 13.10.2017 at 19.30 Mehamn, Norja Observation number 87863

Visibility Unclassified

During the northern lights limit, it was cloudy in Utsjoki and we drove to Mehamni to shoot two cars. One of the most amazing northern lights. I now looked at the pictures through a few pictures of those dune-like stripes all the way down the horizon. Can they be dunes or something else?

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Additional information
  • Colors with unaided eye and other features
    • Red coloration of the shapes top info

      Auroras which have red top part that can be seen with naked eye are most often observed in the bands and long rays. In this case the lower parts are usually green. If the upper parts are in sunlight, red may be stronger than green. This shade of red is due to the discharge of the excitation state of the atomic oxygen.

      Aurora that shift to reddish towards the top. Photo by Karri Pasanen. 

      Red top in a aurora band. Photo by Simo Aikioniemi.

      Red at the top of the aurora. Picture of Tom Eklund.

    • Green auroras info

      Green, seen with the naked eye, is one the most common colors of the aurora. The green color is derived from atomic oxygen.

      Green auroras. Lea Rahtu-Korpela.

      Green auroras. Photo by Juha Ojanperä.

  • 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.

Comments: 5 pcs
Veikko Mäkelä - 2.2.2020 at 13.30 Report this

Ei näytä dyyneiltä, vaan kyseessä on mielestäni monikertaisia revontulivöitä, joiden välissä näkyy tumma raita. Näytelmässä näyttäisi olevan runsaasti kaksin- jopa kolminkertaisia muotoja.

Minna Glad - 2.2.2020 at 21.00 Report this

Ensimmäisessä kuvassa aivan alhaalla revontulen diffuusissa osassa näyttäisi kuitenkin olevan dyynimäisiä raitoja...?

Emma Bruus - 2.2.2020 at 21.24 Report this

Joo se ekan kuvan alareunan himmeä raidoitus voi olla dyynejä tai alapilveä. Orginaalikuvan avullakaan ei selviä kumpaa. O_o Siksi tunnistus jää puuttumaan, ellei samasta setistä saada toista tulkintaa tukevaa kuvaa.

Upea kuvasarja!

Pentti Arpalahti - 3.2.2020 at 04.29 Report this

No on se tylsää, kun ylenpalttinen normireposnäytös peittää heikot dyynit. Havainnon ajankohta on sentään sopiva, kun useita samanaikaisia havaintoja oli Helsinkiä myöten. Ja eikö alapilvi olisi jotenkin näkynyt alimman vyön kirkkaassa alareunassa? Kakkos- ja kolmoskuvassa pilvet ovat ihan mustia viiruja reposten edessä. 

Tero Sipinen - 3.2.2020 at 08.07 Report this

Ykköskuvassa, alimman vyön ja horisontin välissä on raitapatteri, jota on vaikea selittää muuten kuin dyyneillä.

Komea setti ihan niitä "tavallisiakin" tulia!

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