Noctilucent clouds 26./27.7.2012

Observed phenomena: Noctilucent clouds
Observed NLC forms:

  • I (Veil)
  • IIb (Bands with sharply defined edged)
  • IIIa (Waves, short, straight and narrow streaks)
  • O (Unusual forms)

Brightness of the NLCs: 3 (clearly visible, standing out sharply against the twilight sky)

Date: 26./27.7.2012
Time: 00:25-03:25
Observing place: Perniö, Salo, Finland
Observing method: Photography
Technical information about photographing equipment: Camera Canon EOS 1100D, lens Canon EF-S 18-55mm IS

The NLC display of the first night of Cygnus 2013 -convention. I noticed the NLC’s first time @00:25 at low altitude in northern sky. In This display was clearly band -dominated one. During most of duration of this display, there was a long belt, that remained invariably stable. Between 01.00-02.00 I was observing variable stars, and that’s why there is a hiatus in my observing series. I observed the NLC’s until 03:25.

It is possible to separate two different phases from this display:

00:25- ~01:00 NLC’s at low altitude in northern sky, veil (I) and short bands (IIa), dominant colour creamy white.

02:00-03:25 NLC’s had risen higher, long, horizontal band(s) (IIa) dominating the display with some veil (I) and waves (IIIa). In the end of my observing session, only a long, horizontal band (IIa) is visible. Colour  of the NLC’s in this latter phase was typical pale blue.

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