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Ursa Astronomical Association

Quiet aurora band - 23.2.2018 at 20.30 - 23.2.2018 at 21.10 Rovaniemi Observation number 70952

Visibility II / V

Sari Pietikäinen, Corona Borealis, Rovaniemi

The bright evening attracted me to the hunting of northern lights ... And there they were already waiting in the sky when I got to the scene at Norvajärvi. For half an hour I described a very calm arc, the first battery ran out, as did the memory card, and at the same time a herd of tourists with flashlights flocked to the scene. I was just about to leave when the northern lights glanced wildly. There were rays and a very lively northern lights belt and a red bottom visible to the naked eye. And all this best time (maybe 21.00-21.10) I am an unhappy amateur I try to leave my fingers to change the memory card. After all, replacing the battery is a routine ... So that peak of the fire was not even seen when you had to fiddle with technology. Well, I ended up getting a little more red in the picture. The last picture was taken around 21.10. Then you will start to fade, and there was still a big busload of tourists. It was clearly time to surrender. According to the car's meter, the frost was -25 °, so less than an hour was quite an outdoor dose.

More similar observations
Additional information
  • Aurora brightness
    • Bright auroras
  • Colors with unaided eye and other features
    • Red coloration of the shapes lower edge info

      Red lower edge visible with the naked eye. The bands which are starting to level up their activity and are green colored have quite often a narrow red lower edge. This is the most common form of red color which is derived from molecular nitrogen.

      Aurora band with purple lower edge. Photo by Ilmo Kemppainen.

      The low hanging brightest aurora band is colored red at the lower edge. Photo by Tero Ohranen.

      Narrow purple reddish tones at the lower part of this aurora band. Photo by Merja Ruotsalainen.

      Purple band at the bottom. Photo by Panu Lahtinen.

    • 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.

    • 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.

Comments: 4 pcs
Jani Päiväniemi - 25.2.2018 at 13.04 Report this

Näkyyhän siinä ykköskuvassa punaista. Täällä kuusamossa itsekkin sain seurata saman näytöksen. Se punainen reuna oli kyllä todella leveä ja kirkas kun silmin hyvin näkyi. 

Sari Pietikäinen - 25.2.2018 at 13.13 Report this

Näkyy! :) Tuossa vaiheessa se ei vaan enää näkynyt paljain silmin. Aivan kivat tulet oli. Ensi kerralla varmistan ennen pihalle lähtöä, että kortilla on riittävästi tilaa....

Kari Rytilahti - 25.2.2018 at 14.59 Report this

Komeat kuvat olet reposista saanut ja hienostihan tuossa ekassa kuvassa tuota punerrusta näkyy !  Seuraavalla kerralla sit täydet akut ja tilaa muistikortilla riittävästi ettei tarvihe kylmässä ihmetellä...eiks je ?

Sari Pietikäinen - 25.2.2018 at 18.26 Report this

Kiitos, kiitos! Juujuujuuu. Akut olin sentään muistanut ladata, mutta kyllä mä nyt ens kerralla ainaki ton muistikortin muistan. :D :D Toivottavasti. -nimim. vasta puolitoista vuotta kameran omistajana...

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