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Ursa Astronomical Association
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00130 Helsinki
taivaanvahti(at)ursa.fi

Ursa Astronomical Association

Dim night shining clouds - 29.6.2021 at 00.43 - 29.6.2021 at 02.00 Helsinki Observation number 99208

Visibility II / V


It was a dim but (again) wide performance. At first, it seemed to be content with the belts of the northwest at low (Fig. 3), but around the reddish standard cloud patches, wide areas of gauze stood out and also brought out the clusters of waves. The rattlesnake group in the first image, which was 15 degrees above the zenith in the south, has finer structures. Rotating the polarizer, the gauze and ripple could be inferred as night clouds. Together, gauze was present almost everywhere except low in the north and east. When the canola was made from the window, individual pieces of belt were seen in the northwest and north for another two years.



More similar observations
Additional information
  • Havainto
    • Night shining clouds
  • Cloud coverage in the sky
    • Covered 5/8 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.

  • Brightness of the noctilucent clouds
    • Dim night shining clouds
Comments: 2 pcs
Veikko Mäkelä - 29.6.2021 at 11.04 Report this

Tämä oli taas hämmentävän laaja näytelmä. Ja vähän toisintoa useammasta edellisestä yöstä, joissa ylä- ja keskipilvet olivat sekoittamassa tilannetta.  Siis varsin haastava kokemattomille havaitsijoille.  Kuinkahan moni on tulkinnut korkealla olevat pilvet tavallisiksi?

Zeniitin eteläpuolella oli minusta varsin kirkkaitakin läikkiä ja muotoja (noin klo 0.30 tienoilla).  Myös lännessä laaja laineryhmittymä tavallisten pilvien seassa.

Eteläreuna oli 15 astetta etelähorisontista.

Pitäisi saada omatkin havainnot jossain vaiheessa Vahtiin..   

Eero Karvinen - 29.6.2021 at 15.57 Report this

On ollut laaja-alainen näytös. Nyt kun olisi ollut jo elokuun pimeät yöt.

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