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Contact information

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

Ursa Astronomical Association

Half-sky auroras - 30.10.2013 at 22.40 - 30.10.2013 at 23.30 Rovaniemi Observation number 19651

Visibility IV / V


By bedtime, I peeked out the window and immediately the plans changed to photograph the northern lights. Clothes on and with the camera for the car and the scene. In the sky mostly green cloudy gauze, also well south of the sky. After waiting for a while, a brighter belt formed in the Otava area, after which it dimmed and I decided to stop freezing in the latter and returned home under the blanket.

The night before two I peered out and still saw green repos in the middle sky. However, I no longer left to shoot.



More similar observations
Additional information
  • Aurora brightness
    • Bright auroras
  • 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.

  • 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.

    • 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.

    • 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 EOS 60D, Samyang 8mm

Comments: 5 pcs
Mikko Peussa - 2.11.2013 at 23.18 Report this

Huima tuo kaari kolmoskuvassa, jos vertaa miten se näkyy samaan aikaan täällä etelässä :)

Olli Sälevä - 3.11.2013 at 14.17 Report this

Oli oikein mukava, että tuo kaari muodostui tuohon pohjoisen taivaalle. Ilman sitä kuvaussessio olisi jäänyt varsin vaisuksi. Puolen yön jälkeen olisi sitten ollut enemmänkin kuvattavaa.

Tapio Koski - 4.11.2013 at 08.18 Report this

Hienot reposet, tuossa 4 kuvassa mahtavat movemberitkin.

Olli Sälevä - 4.11.2013 at 17.06 Report this

Kiitos. Enpä hoksannut katsoa neloskuvaa tuolta kantilta. :-)

Olli Sälevä - 5.12.2022 at 17.25 Report this

Tutkailin Vahdista vanhoja havaintojani ja tämän havainnon kolmannessa kuvassa on näkyvissä pystysuuntaista raidoitusta. Onkohan kyseessä dyynit vai jotain muuta?

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