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

Ursa Astronomical Association

Clearly visible night shining clouds - 29.7.2021 at 23.23 - 30.7.2021 at 02.08 Helsinki Observation number 100071

Visibility III / V


Belts in the north.

Edit. There were nocturnal nights and norm clouds in the same area, but based on colors and structure, there is no uncertainty of interpretation. Hopefully the craze for scary white power LED spotlights scorching the retinas would not get worse; the yellowish light of an urban area is a convenient identifier for norm clouds. Capella was at about 20 degrees and something separated from the Big Bear -> the dominant form of the north reached 25 degrees. The whole area was from northwest to narrowly northeast, opaque at both ends. Terrain observation 23:56 - 0:09. Window detection in the north dim 0:50.

Edit 2. I tried to roughly estimate the extent of the show when the area is an approximately equilateral triangle with a height of 25 degrees and edges of 10 degrees and a base width of 90 degrees. It doesn’t seem to become a proper eighth of a half of a hemisphere, even though the visual experience is somehow broader. The sky is actually pretty big.

Edit 3. While those belts were still peeking out of the slits in the clouds, the duration of the show had to be extended for more than two. The observation window is now open until four.



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Additional information
  • Havainto
    • Night shining clouds
  • Cloud coverage in the sky
    • Very small area
  • Noctilucent clouds
    • 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.

  • Brightness of the noctilucent clouds
    • Clearly visible night shining clouds
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