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Ursa Astronomical Association

Aurora rays - 22.9.2021 at 03.14 - 22.9.2021 at 03.21 Helsinki Observation number 101369

Visibility II / V

Timing is essential. When the Tampere camera had a nice-looking belt and the window showed greenery after one, I went through three outdoor observation sites in less than an hour and a half - after going through> 40 images in a few images, an uncertain belt that wasn't enough to exceed the reporting threshold. At the end of the toil, a glance at the celestial cameras and out of the window -> For seven minutes, a vibrant belt appeared and beautiful splashes of rays that were clearly visible to the naked eye!

More similar observations
Additional information
  • 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.

  • Aurora brightness
    • Bright auroras
  • Colors with unaided eye and other features
    • Red coloration of the shapes top info

      Auroras which have red top part that can be seen with naked eye are most often observed in the bands and long rays. In this case the lower parts are usually green. If the upper parts are in sunlight, red may be stronger than green. This shade of red is due to the discharge of the excitation state of the atomic oxygen.

      Aurora that shift to reddish towards the top. Photo by Karri Pasanen. 

      Red top in a aurora band. Photo by Simo Aikioniemi.

      Red at the top of the aurora. Picture of Tom Eklund.

Comments: 2 pcs
Georg Kieninger - 22.9.2021 at 10.52 Report this

Onneksi olkoon! Tämän syksyn ensimmäinen repos-havainto Helsingissä. Viitseliäisyys ja osaaminen palkittiin, oikein hyvä juttu.

Pentti Arpalahti - 22.9.2021 at 15.36 Report this

Kiitos onnittelusta. Havainto oli tosiaan epäonnen ja onnen yhdistelmä. Ilma oli selkeä, mutta Kuu valaisi maaston ja taivastakin todella kirkkaasti. Nopea näytös piti kuvata näytön reunaan nojaten käsivaralta puolen sekunnin valotuksilla, mikä toisaalta säilytti hienorakenteen hyvin. Oli upeata ihan oikeasti nähdä(!) säteiden leimahdukset. Niin paljon iloa Aurinko meille antaa.

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