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Ursa Astronomical Association

Half-sky auroras - 13.3.2022 at 20.10 - 13.3.2022 at 20.50 Muurame, Saarenkylä Observation number 105120

Visibility IV / V

Arto Oksanen, Jyväskylän Sirius

Towards the end of the early evening show from Muurame's Saarenkylä. In less than 10 minutes by car, there seemed to be some of the best steps, but it was still handsome when I arrived at the darker spot. In the west, a red light shower resembling Steve was visible even with the naked eye and visible for ten minutes. Was it Steve or not?

More similar observations
Additional information
  • Aurora brightness
    • Bright 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.

    • 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.

    • 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

    • Veil info

      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.

  • Colors with unaided eye and other features
    • 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.

    • Streaming auroras info

      Streaming. In streaming aurora fast irregular variations in brightness occur along the horizontal dimension of homogeneous shapes.

Technical information

Nikon D750, Samyang 14mm f2.8, ISO 1000

Comments: 6 pcs
Heidi Rikala - 14.3.2022 at 17.20 Report this

Onko Steve tuossa kuvassa 4? Pitääkin katsoa omat kuvat uudelleen, tuollainen jäi kyllä kuviin, mutta olin asiasta epävarma.

Arto Oksanen - 14.3.2022 at 19.55 Report this

Ei ole vielä selvyyttä onko Steve vai ei.

Pentti Arpalahti - 16.3.2022 at 03.04 Report this

Sattumalta samaan aikaan 20:39 kuin neloskuvassa sihtasin länteen ja valosaasteen seasta erottui heikko stevemäinen juova

Emma Bruus - 31.1.2023 at 21.09 Report this

STEVEn luokittelussa auttaa jonkin verran ilmiön keston analysointi. Tarvitaan siis ehkä enemmän kuvia, kuin mitä nämä 8 kpl antavat myöten. STEVE kestää kauemmin kuin yksittäinen säde, jotain 10 minuutista hieman yli tuntiin.

Arto Oksanen - 31.1.2023 at 22.01 Report this

Kyllä tuo oli varsin pitkäkestoinen. Yritän löytää lisää kuvia.

Arto Oksanen - 1.2.2023 at 09.08 Report this

Lisäsin ensimmäisen kuvan kuvan "suihkusta". Kestoa ensimmäisen ja viimeisen kuvan välillä kahdeksan minuuttia, mutta muistikuvien mukaan se jäi vielä aika pitkäksi aikaa näkyviin viimeisen kuvan jälkeen. Uuden kuvan mukaan se vaikuttaisi olevan perspektiivi-ilmiö eli suoraan katsojasta poispäin kulkeva revontuliverho, joka saa sen kirkastumaan. 

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