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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Half-sky auroras - 13.10.2016 at 21.30 - 13.10.2016 at 22.30 Vaasa Observation number 57923

Visibility IV / V

Tommi Järvilehto, Vaasan Andromeda

The values of the northern lights were so great that I had to go out to shoot. This time in the heart of Vaasa in the middle of the lights. The handsome Korona flashed for a moment at 9:52 p.m.

Almost a full moon didn't bother. White, red, and green were visible to the naked eye at the time of the corona. Then the Northern Lights faded only into the green spotted carpet of the whole sky visible in the camera.

More similar observations
Additional information
  • Aurora brightness
    • Very 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.

    • White auroras info

      Paljain silmin valkoinen väri näkyy useimmiten himmeissä näytelmissä, kun silmä ei kykene erottamaan mitään varsinaista väriä. Harvoin kirkkaissa näytelmissä valkoinen väri voi myös syntyä sopivista vihreän, punaisen ja sinisen yhdistelmistä.

    • Violet auroras info

      Usually in Lapland or even in the south you can see purple auroras in stronger aurora shows. The most common color in auroras along with green and red.

  • 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.

    • 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.

    • 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

Sony a5000 16mm f / 2.8 1/10s ISO3200

Comments: 4 pcs
Timo Alanko - 14.10.2016 at 08.28 Report this

Tuo kirkon päällä loimuava korona olisi varmaan keskiajalla tehnyt aikamoisen vaikutuksen kansaan  :) Västervikin puolella, muutama kilometri pohjoiseen sai kuvailla vähemmässä valosaasteessa. Erityisen hyvin siellä näkyi tuo pitkä itä-länsi-suuntainen vyö. 

Kaj Höglund - 14.10.2016 at 15.25 Report this

Upeita kuvia!


Juha Kinnunen - 14.10.2016 at 15.57 Report this

Tosiaankin, tuolla saisi kansaa nuhteeseen ;-) Hieno sommittelu!

Samaisen koronan alle näköjään mahduttiin; kuvasin Kyyjärvellä zeniittiä samoilla minuuteilla.

Pirjo Mattila - 14.10.2016 at 23.14 Report this

Mainio kuvauspaikka! Suojelusenkelin siivet kirkkopihalla käyskentelevien yllä viestimässä, että kyllä teitä varjellaan, mutta varokaa nyt sentään itsekin vähän vaaranpaikkoihin joutumasta. Muuten, onpa kaunis kirkko. Pitäisiköhän meidän ottaa mallia, kun uutta suunnittelemme parhaillaan.

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