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Ursa Astronomical Association
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Ursa Astronomical Association

Half-sky auroras - 10.2.2022 at 19.00 - 11.2.2022 at 06.00 Hankasalmi, Murtoinen Observation number 104494

Visibility IV / V

Arto Oksanen, Jyväskylän Sirius

Bright and wide-ranging northern lights practically all night in the pictures of the Hankasalmi Observatory's AllSky camera. The bright moonlight obstructed visibility.

Possible SAR arc at 19:13? Admittedly not quite east-west and short-lived. #sarg

All night timelapse:

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.

    • 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: 6 pcs
Mauri Korpi - 11.2.2022 at 13.27 Report this

Sar kaari 16 s kohdalla?

Arto Oksanen - 11.2.2022 at 17.41 Report this

Huomasin sen itsekin, mutta punaisen kaaren suunta ja lyhytaikaisuus eivät ole oikein tyypillisiä ja siksi en merkannut sitä SAR-kaareksi. Lisäsin pari kuvaa.

Mikko Peussa - 11.2.2022 at 17.52 Report this

SAR-kaari lisätty ylläpidollisesti. Kahdessa kuvassa menee koko taivaan yli punainen kaari, joten eiköhän se SAR-kaari ole. Hieno setti!

Eero Karvinen - 12.2.2022 at 12.18 Report this

Kahdessa alimmassa kuvassa on hyvin tyypillinen SAR-kaari.

Arto Oksanen - 12.2.2022 at 14.51 Report this

SAR-kaari on yleensä aika tarkasti itä-länsi-suunnassa, mutta tässä on selvästi vinossa. Mutta japanilainen tutkijakin oli sitä mieltä että on SAR ja samanaikaiset magneettikenttämittauksetkin tukevat sen esiintymistä. On myös varsin kirkas, kun näkyy näin kirkkaassa kuunvalossa. 

Eero Karvinen - 13.2.2022 at 01.03 Report this

SAR kaaren morfologia on varsin laaja ja tuo, että kaari on kulmassa, on sekin havaittu aiemmissä tutkimuksissa. Vain osa SAR kaarista on stabiileja viivoja idästä länteen ja pysyvät paikallaan.

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