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Ursa Astronomical Association
Kopernikuksentie 1
00130 Helsinki

Ursa Astronomical Association

Clearly visible night shining clouds - 21.6.2021 at 00.49 - 21.6.2021 at 01.40 Helsinki Observation number 99029

Visibility III / V

The long belt reached the zenith even before one. The ragged vortices were concentrated on the west side. Visually, the belt was separated in zenith by another 1:40. It was a pretty nice performance compared to the time.

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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.

    • 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
Comments: 2 pcs
Timo Alanko - 21.6.2021 at 20.35 Report this

Jaahas. Onpas ristiriitainen tilanne. Kesä on parhaimmillaan ja näitä katsellessa odottaa vain, että se menee nopeasti ohi ja täällä Pohjanmaallakin taivas alkaisi taas pimentyä. Hmm.... 

Veikko Mäkelä - 23.6.2021 at 12.05 Report this

Oli laaja näytelmä.  Huomasin yöpilvet jo niinkin aikaisin kuin klo 0.05.   Siinä enne klo 1:tä näytelmä levittäytyi lähes etelähorisonttiin asit (noin 15° etelähorisontista).  Ja tuo pitkä vyö (tai oikeastaa IVc-pyörre, kun on selkeästi kaareutunut muoto oli hallitseva.

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