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Ursa Astronomical Association
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taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Half-sky auroras - 7.11.2017 at 20.06 - 7.11.2017 at 20.32 Rovaniemi Observation number 68127

Visibility IV / V

Sari Pietikäinen, Corona Borealis, Rovaniemi

I noticed northern lights above the center of Rovaniemi, and immediately set out in search of a darker place. When I got to Lake Norvajärvi, the show was already well on, and I didn't really find a good place to shoot when I didn't dare go on the ice yet ... I ended up directly under the power line, which of course is not a good thing when Korona hits on. Nooooh. First time with better luck. The first picture was taken on 20.22, Korona 20.14, and the third picture on the first, i.e. 20.06. At half past nine the clouds started to come on, and the fire was fading, so I gave up tonight.



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.

    • 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.

Comments: 6 pcs
Sari Pietikäinen - 7.11.2017 at 23.54 Report this

Kas, kuvat tuli eri järjestykseen kuin mitä mielestäni laitoin.... Noh, samapa tuo. Keskimmäinen kuva on ensimmäisenä otettu, ja ensimmäinen viimeisenä. Tai jotain. :D

Antero Ohranen - 8.11.2017 at 07.43 Report this

Hienot reposet!

Tommi Lyytikäinen - 8.11.2017 at 14.49 Report this

Voi että. Katselin samaa, mutta huomasin että ne katosivat. Lähdettiin kuitenkin ystävien kanssa laavulle, näkötornille joka on siinä Ounasvaaralla. Klo 01 aikaan alkoin näkymään mahtavaa showta. Kesti aika kauan ja oli melkoisen muuttuvat ja tanssivat tulet. Näkyi paljon punaisia sävyjä, ja hieno välkehtivä korona. En saanut paljon kuvia mutta ajattelin laittaa ne tänne kuitenkin. Tuo sinun paikka näyttäisi välttyvän valosaasteelta, täytyy ensi kerralla mennä sinne. Hienot kuvat!

Sari Pietikäinen - 8.11.2017 at 16.50 Report this

Aika kiva ja valosaasteeton paikka tuo Norvajärven p-paikka on. Ja siitä johtuen siellä on toki sitten paljon porukkaa kuvaamassa. Ja kunhan sesonki kunnolla alkaa, niin turistiryhmät valtaavat paikan taskulamppuineen ja nuotioineen....
Puolenyön aikaan kurkistin vielä parvekkeelta pihalle ja tosiaan siellä oli toinen näytös menossa, siinä vaiheessa oli vaan luovutettava ja mentävä nukkumaan. Jospa joku pikainen parvekekuva kuitenkin onnistui.

Olli Sälevä - 8.11.2017 at 20.02 Report this

Hienot reposet näköjään jo illalla. Itse kuvasin vasta puolen yön jälkeen.

Kari Rytilahti - 8.11.2017 at 21.48 Report this

Laadukasta jälkeä upeista reposista !

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