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Skywarden,
Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Half-sky auroras - 3.2.2022 at 22.56 - 3.2.2022 at 23.21 Kittilä Observation number 104428

Visibility III / V

Pasi Tuomainen, Ursa (Itä-Suomi)

I drove on Thursday 3.2. The weather forecast for Levi and the northern lights in the next few days was quite crushing - snow and clouds all the time. Thursday was still partially clear, so hurry up to the camera armpit and go!

I went to the top of Levi to shoot a reasonably powerful play and light pillars, and I took my girlfriend with me and then navigated to Pöntsö Bridge. Northern lights activity faded towards the end of the evening, but all the time the dim northern lights fluttered in the sky. After the corona play, my attention was drawn especially to the spectacular pink east-west arc, which was quite stationary and did not live to the beat of other northern lights. It took at least half an hour. To the east were also clear black streaks on the pink. Is it Steve? Or is there someone else with that name?

The image taken up shows a faint horizontal reddish stripe. The Pleiades in the lower right corner, and the red stars to its left, are probably Aldebara and Betelgeuse, so the arc is also east-west, unlike that northern lights belt that runs on it.



More similar observations
Additional information
  • Aurora brightness
    • Dim 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.

    • 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

    • Form not identifiable info

      Form not identifiable
      Sometimes auroras have to be observed in such poor conditions that it is not possible to reliably identify the shape even if for example the structure and conditions could be recognized. Such a situation could be the outcome of for example alight background sky, cloud cover or a covered horizon.

Technical information

Nikon D800, Sigma Art 20mm f / 1.4, ISO 1000, 5-10 s.

Comments: 2 pcs
Emma Bruus - 8.2.2022 at 09.42 Report this

En uskaltanut tästä STEVEä raksia, kun taustalla on tätä vihreää revontulta.

Kaksi asiaa jotka kuvissa puhuvat STEVEn puolesta ovat violetti sävy ja ensimmäisen kuvan tumma alue violetin revontulen molemmin puolin. Tämä on nimenomaan STEVEn yhteydessä tunnettu ilmiö ja näkynyt myös muutamissa muissa Taivaanvahdin havainnoissa.

Toisaalta jos hyvin korkealla pohjoisessa näkyisi STEVE, se sekoittuisi helposti muuhun revontuleen. Mutta tämä on silti hyvin epäselvä tapaus, sillä Lapissa otetuista kuvista on lähes mahdotonta erottaa STEVEä violetista säteestä, ellei violetiltavan harmahtava sävy ole puhdas/erillään vihreästä. Hyvissä tulissa näin taas harvoin käy.

Hienoa settiä kuitenkin ja toivottavasti näistä selityksistä oli apua!

Eero Karvinen - 9.2.2022 at 14.37 Report this

Komeita kuvia. Kurkkaus Pintahavaintoihin, magnetometrin dataan kertoo tilanteen liittyneen kohtalaisen voimakkaan alimyrskyn myöhäiseen palautumisvaiheeseen, STEVEN tyypillinen esiintymispaikka alimyrskyn suhteen. Kellonaika huomioiden kyseessä hyvin todennäköisesti on lähes paikallaan pysyneet säikeet lähellä Harangin epäjatkuvuusaluetta. Diskreettien säikeiden puolesta puhuu myös pinkin emission sijainti lähes keskellä ovaalia, eikä aivan sen eteläreunalla, tai selkeästi irtonaisesti eteläpuolella. Kuvasarjoissa säikeet näyttäisivät lähtevän yhdestä pisteestä, eli kuvauspaikka sijaitsee ns. koronan alapuolella. Tummat alueet ovat vastakkaismerkkisiä kentän suuntaisia (FAC) virtoja. Mustissa kohdissa elektronit karkaavat takaisin avaruuteen ja emissiota ei ehdi syntyä.

STEVE:n esiintymistä en täysin kieltäisi, mutta jättää tämä paljon epäilyksen varaa.

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