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Ursa Astronomical Association

Active aurora band - 19.12.2021 at 21.55 - 19.12.2021 at 22.20 Vaala Observation number 103233

Visibility III / V

Jarmo Moilanen, Ursa (Pohjois-Suomi)

Coincidentally, I noticed from the fireball camera monitor that there are northern lights in the south sky. When I got out from east to west, a clear arc brightened, which soon began to wave and a couple of loops went east. After watching for a while, the northern lights dimmed and moved north.
Figure 1 was taken at 22.05 SA and Figure 2 at 22.06.

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.

    • 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.

    • 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.

  • 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.

    • 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.

Technical information

Pictured with an Olympus Though TG-6 paperback with a fisheye attachment.

Comments: 2 pcs
Pekka Parviainen - 1.1.2022 at 17.34 Report this

Kaunis kuva. Melkoiset reposet ovat olleet, kun Tough:lla näin kauniin kuvan saa talitoitua.

Jarmo Moilanen - 2.1.2022 at 16.22 Report this

Kirkkaathan ne tässä vaiheessa olivat.

Kuvissa on usempi 4 sekunnin valotus aukolla f/2 ja ISO200lla yhdessä. Kuvat on otettu Tough:n yökuvausmoodilla jossa pitkän valotuksen aikana tallennetaan vain kirkkain pikseliarvo eli ovat ns. peak hold kuvia. Tai Olympuksen terminologialla Live composite eli suomeksi Live-yhdistelmä kuvia. Kamera ei valitettavasti tallenna sitä tietoa montako kuvaa yhdistelmässä on, mutta muistaakseni pidin kokonaisvalotuksen jossain 20-30 sekunnissa ettei revontulet liikaa puuroudu. Peak hold kuvissa ei ole vaaraa kuvan ylivalottumisesta kuten normaalissa pitkässä aikavalotuksessa.

Hiukan olen toki käsitellyt kuvia jälkikäteen, mutta nämä on kameran jpg-tiedoistoja. Olympuksen .ORF raw-tiedostotkin olisi näistä olemassa, mutta en tällä hetkellä pysty niitä työstämään.

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