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

Ursa Astronomical Association

Bright night shining clouds - 4.8.2021 at 01.36 Äänekoski Observation number 100184

Visibility IV / V


The northern sky again showed illuminated night clouds and the moon



More similar observations
Additional information
  • Havainto
    • Night shining clouds
  • 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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