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Ursa Astronomical Association
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00130 Helsinki

Ursa Astronomical Association

Bright night shining clouds - 27.7.2021 at 23.30 - 28.7.2021 at 03.00 Akaa ja Urjala Observation number 100024

Visibility IV / V

I first saw the night clouds as a kpton at 11.30pm. At the first observation point in Akaan Kylmäkoski, I was just before midnight. The play was then at its widest, from west to east and 35 degrees high, the best pieces at that point in the north (Fig. 2). I changed the observation site to Urjala (Figures 3,4 and 5). Great bright play, no more scope. At the end of the night I drove to Akaas beach, for the first time this summer the water surface was completely calm, yes it was beautiful to see (picture 1.).

Additional information
  • Havainto
    • Night shining clouds
  • Cloud coverage in the sky
    • Covered 1/4 of the sky
  • Noctilucent clouds
    • Swirl info

      Swirls are curved night shining cloud forms. For example, a single night cloud belt or group of waves may be curved on a clear bend.

      The arrow indicates a slight vortex in the night cloud belt. Photo by Joni Tahkoniemi.

      Strong swirls in image taken by Veikko Mäkelä.

    • Waves info

      Waves of noctilucent clouds are short, close groups of clouds.

      Wavy NLC by Jari Luomanen.


      NLC waves by Hannu Määttänen.

    • Band info

      Bands of noctilucent clouds are long, stripe like cloudformation.

      A single, very bright NLC band. Photo by Mikko Peussa.


      On the upper left corner, rising bands are clear on the image. Whereas waves of NLC cover the bottom right side of the image. Photo by Juha Tonttila.

    • Veil info

      The night cloud vail is a vague thin night shining cloud with no clear structure.

      Noctilucent cloud veil with one strong belt formation. Image by Veikko Mäkelä.

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