Bright display of noctilucent clouds 8./9.7.2013

Observed phenomena: Noctilucent clouds
Observed NLC forms:

  • I (Veil)
  • IIa (Bands with diffuse, blurred edges)
  • IIb (Bands with sharply defined edges)
  • IIIa (Waves, short, straight and narrow streaks)
  • IIIb (Wave-like structure with undulations)
  • IVa: Whirls with small angular radius (0.1 – 0.5 degrees)
  • IVb: Simple curve(s) with angular radius of 3 – 5 degrees
  • O (Unusual forms)

Brightness of the NLCs: 4 (very bright and attracting the attention of casual observers)

Date: 8./9.7.2013
Time: 01:30-02:20
Observing place: Turku, Finland
Observing method: Photography
Technical information about photographing equipment: Canon EOS 1100D, Canon EF-S 18-55mm IS, Samyang 8mm fish eye

I observed a bright display of noctilucent clouds in the night between 8th and 9th of July 2013. This display was clearly the brightest so far this summer! This display was very dynamic and it was evolving rapidly. The NLC’s covered a large area of the sky and they were concentrated on the northern sector of the sky. Only the southern sector of the sky was clear of noctilucent clouds, because the shadow of the Earth was limiting the visibility of the NLC’s. The dominant NLC forms in this display were veil (I) and sharply defined belts (IIb), but also many other forms were present. This NLC display was observed also in many other places in Europe, for example in Denmark.


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