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

Ursa Astronomical Association

Eye-catching night shining clouds - 20.7.2021 at 23.28 - 21.7.2021 at 04.20 Helsinki Observation number 99770

Visibility V / V


It just was the best of the season ... not when after ... not when it was now. Mass, brightness ... just before midnight the window showed the belts so high that I had to really reach out ... grab a couple of belts and then put the canola ... out into the yard ... not when the wider view ... half the sky with giant fish bones .. .1h15 min rumbled in the search for compositions .... Top street view at 0:45. The lightroom had to dampen the nights. Rapeseed 1st edition 1:40 and the performance continues.

Edit. The show ranked between west and northeast, extending almost to the zenith. Figure 2 shows the still faint extensive fish bones at the beginning of the show. Bright calmly curving nights appeared as the show progressed. After three more, the carpet formed by the belts reached a height of 80 degrees in the lightening sky in the north.

Edit 2. From the window you could follow the final shutdown of the show. When I knew where to look, at a height of about 60 degrees, the sharp-edged belt stood out at 4:20 and I even got a picture of it taken through the stained window. Rotating the pola, the wire disappeared. The Stellarium gave the height of the Sun's center point then - 2 degrees. The timestamp of the image is about one and a half minutes behind. The Nikon watch doesn't really keep up with the times.

Edit 3. I was still checking when I took the picture. Camera error was - 1min 40 sec. According to the Stellarium, the height of the Sun in the coordinates of the observation site was -2 degrees 01 '17' '. The distance between the night clouds and the Sun was about 60 degrees.



More similar observations
Additional information
  • Havainto
    • Night shining clouds
  • Cloud coverage in the sky
    • Covered about half 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
    • Eye-catching night shining clouds
Comments: 4 pcs
Sirkku Turunen - 21.7.2021 at 02.09 Report this

Kiitos,kun laitoit kuvat!!

Itsekin näin ne enkä ollut uskoa näkemääni. Todella hyvät kuvat sulla!!

Pentti Arpalahti - 21.7.2021 at 04.23 Report this

Kiitokset, oli kyllä esitys. Oli kirkasta tavaraa ja hyvä seeing.  Pohjoisessa erottui 60 asteen korkeudella himmeä vyö vielä klo 4:20, kun Auringon korkeus oli - 2 astetta.

Veikko Mäkelä - 25.7.2021 at 00.25 Report this

Tuo klo 4.20 on aika kova tulos..  Itse asiassa se taitaa olla vähemmän kuin -2 astetta (refraktiokorjattuna).  Itse vilkaisin vielä klo 3.45 ja silloin näkyi hyvin.  Se vastaa korkeutta -4,5°.

Kirjaatko loppuajan viimeisen näkyneen yöpilven mukaan, niin ei tarvitse kaivaa havaintokertomuksista vaan näkyy suoraan havaintoajasta.

Pentti Arpalahti - 25.7.2021 at 03.28 Report this

Refraktiokorjausta vähän pähkäilin Stellariumissa. Se kai riippuu  ilmakehän olosuhteistakin. Laitan havaintoajaksi vihonviimeisen yökön henkäyksen.

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