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Ursa Astronomical Association
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Ursa Astronomical Association

Clearly visible night shining clouds - 6.7.2015 at 00.15 - 6.7.2015 at 01.25 Imatra, Onnela Observation number 39619

Visibility III / V

Veikko Mäkelä, Ursa (Helsinki)

I waited for the sky to darken in front of the computer. The first warnings came from Matias Takala already in the midnight countries. True, the first time we went outside at 0.15, the night clouds were already clearly visible.

The play turned out to be extensive. Especially the east, southeast and south (!) Directions dominate. At its southernmost, the night clouds were visible at a height of twenty degrees from the southern horizon.

Even in the north, night clouds were visible, but due to the brightness of the sky, that direction remained weak. There were no very bright ones in the west either, even though the cloudy area reached out there dimly.

It seemed that the farther east Finland was observed, the better the night clouds were visible. I saw that I was quite in the desert tonight. The play seemed to improve as the night progressed.

The play was very diverse. Almost every form was found. If the play is to be typed into something, it was mainly the case of the belt-vortex type, but there were plenty of spotty night clouds among them.

The brightness was at best k = 3 (clearly visible), almost brightness 4. However, the bright sky ate the contrast, so for the marked k = 3 value.

At 0.15
Azimuth: 120-320? °
Elevation: -140 °
Forms: I, IIab, IIIb, 0
Brightness: 1-2
Colors: Va

At 0.30
Azimuth: 140-220 °
Height: 10-160 °
Forms: I, IIab, IIIb, IVc, 0
Brightness: 1-3
Colors: Va

1.25 p.m.
Azimuth: 140-220 °
Height: 5-160 °
Forms: I, IIab, IIIb, IVabc, 0;
Additional features: S (cross lines)
Brightness: 1-3
Colors: Va

Image directions:

(1) SE, (2) E, (3) SE, (4) S, (5) SW, (6) NE, (7) SW, (8) S

More similar observations
Additional information
  • Havainto
    • Night shining clouds
  • Cloud coverage in the sky
    • Covered 3/4 of the sky
  • 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.

    • 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.

    • 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
    • Clearly visible night shining clouds
Technical information

Images at 1.21, 0.26, 0.27, 0.48, 0.49, 0.50, 0.52 and 1.22
Nikon D200; Nikkor AF-S 18-70 @ 18 mm; f / 10; 13 s, 8 s, 8 s, 14 s, 13 s, 6 s, 13 s and 18 s; ISO 100
partial blurred mask, highpass sharpen, edge preserving smooth, levels

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