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

Visibility III / V

Pentti Arpalahti

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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1 4

Additional information

Havainto
- Night shining clouds
Cloud coverage in the sky
- Covered 5/8 of the sky
Noctilucent clouds
- Swirl
  
  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
  
  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

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

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