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)
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.