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Ursa Astronomical Association
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Ursa Astronomical Association

Half-sky auroras - 3.10.2015 at 23.30 - 4.10.2015 at 02.00 Inari Observation number 43297

Visibility IV / V

Juha Kinnunen, Jyväskylän Sirius

The usual Northern Lights show for Northern Laplanders, started little by little in the evening and continued into the morning hours. Nice clear and windless night.

Nikon D800, Nikkor 14 mm @ f2.8, 4 s, 3200 ASA

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

Comments: 3 pcs
Heidi Rikala - 4.10.2015 at 18.48 Report this

Hienot reposet, vaikka sanot , että ne on teilläpäin tavaomaiset, niin kelpaisi kovasti myös tänne Ikaalisten korkeudelle ihasteltaviksi. :)

Juha Kinnunen - 4.10.2015 at 20.18 Report this

Kiitos kommentista - kyllä ne minunkin keskisuomalaisia silmiäni miellyttivät kovasti. Lappi on aina Lappi.

Raija Ollikainen - 4.10.2015 at 23.23 Report this

@ Heidi, minäkin hyppisin tasajalkaa tullaisista kuvista. Mutta se on kato niitä juttuja, kun minun Ylitorniolta kotoisin oleva, Ouluun asettunut työkaverini kommentoi minun ihan ensimmäisiä [tietysti hienoja ;)] oululaisia revontulikuviani: "Tuommosiako sie viitit yökauet jahata?! Eihän net ole mithään, ko eijjole värejä! Meän kläpikki joskus pihala huutelee ko näkehvät revontulia, mutta mie en kyllä viiti mennä ees käyhmään sielä, ko net ei ole Ouhlusa tuon kummempia."

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