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Ursa Astronomical Association

Clearly visible night shining clouds - 24.7.2021 at 01.19 - 24.7.2021 at 03.30 Kouvola Observation number 100108

Visibility III / V

Tero Sipinen, Ursa (Etelä-Suomi)

Shortly before, I put one camera on duty at night with clouds at minute intervals. The cloudy skies didn’t look very promising, and at 1:20 a.m., when I performed my last visual glimpse to the north, almost the entire north had become clogged. Only at very low was a narrow cloud gap and in it I separated a light line from which I was not at all sure if it would be a night cloud. Later, when examining the image catch, I saw that half of the two countries in the lower cloud mass had begun to recede, revealing low night cloud streaks. Rewinding at 1.19 the picture was the first from which the streaks were distinguishable. So I had happened to glance out at the very moment when the night clouds had started to appear. At a later stage, surfboards appeared a little higher.

First picture at 2.29, second picture at 2.51. Rough animation of a triangular image from 0.41-3.32

Tube night no. 15

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Additional information
  • Havainto
    • Night shining clouds
  • Noctilucent clouds
    • Waves info

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

      Wavy NLC by Jari Luomanen.


      NLC waves by Hannu Määttänen.

    • 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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