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Ursa Astronomical Association

Active aurora band - 12.10.2021 at 22.30 Hankasalmi, Murtoinen Observation number 101778

Visibility III / V

Arto Oksanen, Jyväskylän Sirius

The bright northern lights were badly left behind the clouds, but as the sky became clear for a moment, in addition to the high northern lights of the northern sky, a red northern lights belt moving rapidly southward appeared in the zenith. SAR?

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More similar observations
Additional information
  • Aurora brightness
    • Bright auroras
  • Observed aurora forms
    • 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.

    • 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

    • Stable Auroral Red (SAR) arc info

      The Stable Auroral Red arcs (SAR arcs)  are usually clearly distanced to the south from the aurora oval and is a very opaque and normally red ribbon. In most cases SAR arcs are only visible in the photo or on the liveview screen of the SLR camera. Using a camera with very high sensitivity is the best method for capturing these faint arcs. The arch usually settles between east and west.

      A stable red arc of aurora is a rare phenomenon. In some rare occasions, several SAR arcs may be simultaneously visible.

      The first SAR arcs of the Skywarden were observed on nights between November 3-4. and 4-5. days in 2015 in the latitudes of central Finland.   

      SAR arc photographed by Lasse Nurminen 2018. Observation of the Skywarden 79113.

Technical information

Alcor System OMEA-1.3M-HCA AllSky camera

Comments: 2 pcs
Timo Kuhmonen - 13.10.2021 at 14.26 Report this

Onpahan melkolailla samaa paikkaa tuo kaari, mitä itsekin näin eilen Vesannolla. Kuvat otin digikameralla 22:52 (paikallista aikaa). Noin 10...15 min sitä ennen näkyi kapea kaari zeniitissä Vesannolla. Oli kaari kadonnut kun tulin kameran kanssa ulos. Läheltä Kassiopeijaa se meni. Paljain silmin siinä en nähnyt värejä, kuitenkin kirkkaudeltaan erottui selvästi. Olisikohan niin ettei silmät ole kovin herkkiä punaiselle värille? Havaintoja haittasi paksut sumulautat ja taivaan pilvisyys...

Eero Karvinen - 13.10.2021 at 23.33 Report this

Nätti SAR-kaari. Hyvin samankaltainen, kuin huhtikuun 16-17. pv näytelmässä ennen alimyrskyn syttymistä. Viimeöisen SAR-kaaren havaitsin vain valokuvista.

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