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Ursa Astronomical Association
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Ursa Astronomical Association

Aurora rays - 8.10.2015 at 20.30 - 8.10.2015 at 21.15 Lapua Observation number 43854

Visibility II / V

Antti Rinne, Ursa (Länsi-Suomi)

All the northern lights were tired when tonight he could no longer cope with the camera.

Shortly after sunset, a northern style belt and arc began to appear in the northern sky in a familiar style. I was just arranging the children for the night tree when I got an alert from the direction of Kuortane that I was bothering now all the way to the yard. I had to bother.

Nothing was visible in the north, but directly above the rays reached out towards the zenith. I tried this on that paper for a little draw. The rays were green, not blue as in the picture.

I didn't have time to wonder about this for a long time, when a lot of noise started to carry inside. The firstborn had also tried to peek through the northern lights from the window and at the same time had poured a full glass of water on his table. That such a sound caused by northern lights now then became apparent.

This long phase did not last long. As I write this at 11:30 pm, the northern lights are still red, but the sky is calm outside.

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
    • 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.

Technical information

Notepad and Zebra gel pen

Comments: 5 pcs
Mikko Peussa - 8.10.2015 at 22.54 Report this

Piristävä piirroshavainto. Kuvassa näyttää kyllä sinisiltä revontulisäteiltä eikä vihreiltä ;-)

Antti Rinne - 8.10.2015 at 23.21 Report this

Kiitos! Pahoittelen piirroksen epätarkkuutta tältä osin Mutta tuossa raportissa on kyllä mainittu "Säteet olivat vihreitä, eivät sinisiä kuten kuvassa." :-)

Mikko Peussa - 8.10.2015 at 23.44 Report this

Kiitos Antti tarkennuksesta. Enpä huomannut tuota, että asia olikin jo mainittu. Useinhan ne on kuvissa "vähän" erilaisia kuin visuaalisesti ;-)

Raija Ollikainen - 9.10.2015 at 08.15 Report this

Komppaan Mikkoa, tämä on erittäin piristävä ja selkeä havaintokuva! :D Toivottavasti vesilasikatastrofin seuraukset eivät olleet järkyttävät ja esikoinen sai nukutuksi. :)

Matti Helin - 9.10.2015 at 09.02 Report this


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