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

Ursa Astronomical Association

Aurora rays - 2.4.2022 at 21.48 - 3.4.2022 at 02.35 Helsinki, Tampere Observation number 105947

Visibility I / V


Northern Lights Bong is a second game. When the Z-component fell in Nurmijärvi, I took pictures every few minutes. Only in the first box a dim ray stood out and in the second box something even weaker and then nothing more. For safety, I checked the northern camera in Tampere and there were clear rays 18:47:57 UTC. My camera's timestamp is 21:48:11 daylight saving time. The clock on my camera is 13 seconds ahead, so the first beam should probably be the same as in Tampere, whose camera is probably on time. The shutter speed of my camera was 3 s. Edit. Nurmijärvi Z fell more gently between two and three and another beam caught the cell at 2:34:45. That semmonen show. Edit 2 Tampere's camera is sensitive and the location is not even funnier. I used the stars to superimpose the images on top of each other. The performance was dim in Tampere as well and, based on a pair of images, represents the lower limit for Helsinki's observation. If the revos in Tampere rise above 25 degrees and are brighter, then in good weather in Helsinki the repos should stand out at 15 degrees, at least from the photographs with reasonable editing.



More similar observations
Additional information
  • Aurora brightness
    • Can only be seen in photos
  • 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

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