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Ursa Astronomical Association
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Ursa Astronomical Association

Half-sky auroras - 20.9.2022 at 00.33 - 20.9.2022 at 00.40 Enontekiö Observation number 109462

Visibility IV / V

Sakari Ekko, Turun Ursa

My intention was to take a picture of the entire visible sky with the Milky Way visible across the sky to use on Tuesday 9/20. in the starry night, but the northern lights ruined my plans. On the other hand, I wasn't sorry. First, there was a bright arc across the sky through the zenith, and when I got to the shooting location and got the camera on the tripod, a handsome show began, which lasted only a couple of minutes. Then the green glow of the aurora borealis covered the sky in spots, and the clouds came quickly. Two of the series of half a dozen pictures were worth mentioning. The fisheye I'm using doesn't draw a full circle on the MFT sensor, and I tried to fix that by rotating the camera 90 degrees, which would have allowed the images to be combined in image processing, but the auroras changed too quickly.

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Additional information
  • Observed aurora forms
    • 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.

  • Colors with unaided eye and other features
    • Green auroras info

      Green, seen with the naked eye, is one the most common colors of the aurora. The green color is derived from atomic oxygen.

      Green auroras. Lea Rahtu-Korpela.

      Green auroras. Photo by Juha Ojanperä.

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