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Ursa Astronomical Association
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Ursa Astronomical Association

Dim night shining clouds - 31.7.2011 at 00.05 Turku Observation number 846

Visibility II / V

Joni Tahkoniemi, Ursa (Länsi-Suomi)

In the beginning, dim belts were visible and it already looked promising when the clouds brightened at a good pace. However, the joy did not last long when
began to dim almost as quickly.

Before going to bed, a quick look from the balcony and I had to point it out, while the clouds were a little brighter. In that case, there was a clear movement even with the eyes as you followed the left edge of the night cloud board for a few minutes.

More night clouds .

00.00: 300-020, 08-30, IIab 1-2
00:30: 280-035, 10-20, IIab 1-3
01.00: 300-045, 05-15, I IIab 1-2
02:00: 315-065, 05-15, I IIa IVabc 0 1-3 VaS

More similar observations
Additional information
  • Cloud coverage in the sky
    • Covered 1/4 of the sky
  • Havainto
    • Night shining clouds
  • Noctilucent clouds
    • Unusual forms info

      Relatively rarely, there are special shapes in the night shining cloud displays that do not belong to the shapes listed above. Such may be, for example, thick lumpy formations that appear as some kind of patches. They may also be associated with an unusual color tone.

    • 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.

    • 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
Technical information

Canon 40D + EF-S 17-85mm f / 4-5.6

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