Bright noctilucent clouds 11./12.7.2014

Observed phenomena: Noctilucent clouds
Observed NLC forms:

  • I (Veil)
  • IIa (Bands with diffuse, blurred edges)
  • IIb (Bands with sharply defined edges)
  • IIIa (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)
  • IVc (Large-scale whirls)
  • 0 (A form which does not fit into types I – IV)
  • S (NLC with bright ‘knots’)
  • P (Billows crossing a band)

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

Elevation: 130°

Date: 11./12.7.2014
Time: 22:00-00:00 UT
Observing place: Turku, Finland
Observing method: Photography
Technical information about photographing equipment: Canon EOS 1100D, Canon EF-S 18-55mm

A very bright all-sky NLC display appeared in the sky of Turku in the night between 11th and 12th of July 2014! During the night, the NLC’s extended long way to the southern sky, only the shadow of Earth was limiting the visibility of NLC’s. In this display, practically all kinds of NLC forms were visible. The display was dominated by a persistent fan-like structure formed by NLC belts which was opening from northeastern sky. Some belts in western sky reached brightness 5, which is the highest brightness in the brightness scale used with noctilucent clouds. The NLC’s were also very persistent, and it took long time for them to vanish completely to the sunrise. I noticed the NLC’s at 22:00 UT and they were visible still at 01:00 UT, when sky was already very light!.


2 thoughts on “Bright noctilucent clouds 11./12.7.2014

  1. FlyTrapMan July 13, 2014 / 01:15

    Nice images! I’m ashamed to say I never seen a noctilucent cloud. I’m not sure if the temperature becomes cold enough in New England for them to form, but I could be mistaken.

  2. Juha Ojanperä July 13, 2014 / 11:22

    Thanks for commenting! New England is far too south for noctilucent clouds. Noctilucent clouds can be seen from latitudes 50-65, which means, that the best regions to see the NLC’s in North America is Northern Canada and Alaska.

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