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Ursa Astronomical Association
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Ursa Astronomical Association

Bright night shining clouds - 25.7.2018 at 23.57 - 26.7.2018 at 02.40 Helsinki Observation number 75682

Visibility IV / V

The performance was well under way at midnight. I took field shots in less than an hour until 0.51. The show was between northwest and north and remained roughly in place. When I looked at the pictures while still half past three from the narrow view of the window to the north, the show just went on. There were long wide belts in the sky. The use of the highest spectacle categories was already under consideration. Two consecutive negays came to a fair credit.

More similar observations
Additional information
  • Havainto
    • Night shining clouds
  • Cloud coverage in the sky
    • Covered 1/4 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.

  • Brightness of the noctilucent clouds
    • Bright night shining clouds
Comments: 3 pcs
Jukka Kytömäki - 26.7.2018 at 12.11 Report this

Komeata pukkasi. Tällä kertaa niin idässä, kuin lännessäkin kuvatut pilvikuviot olivat samanmuotoiset. Eli pilvet olleet todennäköisesti suhteellisen korkealla.

Veikko Mäkelä - 26.7.2018 at 13.19 Report this

Kyllä tuo kirkkaimpien muotojen osalta mielestäni kipusi kirkkaasi (k=4) tai jopa huomiota herättävän kirkkaaksi (k5).  Oli toki laajoja alueita himmeämpää yöpilveä.

Olen tavannut kuitenkin suositella maksimi-intensiteetin käyttöä kirkkausluokituksessa.

Pentti Arpalahti - 27.7.2018 at 02.28 Report this

Joo, oli ne oikeastaan kirkkaita.

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