Bright noctilucent clouds in the sky of Turku 19./20.7.2013

Observed phenomena: Noctilucent clouds
Observed NLC forms:

I (Veil)
IIb (Bands with sharply defined edges)
IIIa (Waves, short, straight and narrow streaks)
IVb: Simple curve(s) with angular radius of 3 – 5 degrees

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

Date: 19./20.7.2013
Time: 00:50-02:15
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

A bright display of noctilucent clouds was observed in the sky of Turku, Finland in the night between 19th and 20th of July, 2013. I was observing the display in the Luolavuori -hill, which is situated few kilometres south from Turku downtown. From the hill, the horizon is totally open to every direction!

On that night, there were two detached NLC areas in the northern sector of the sky. The NLC’s covered the northern half of the sky from west to east, ant the maximum altitude of the NLC’s was about 40°. Especially the NLC area located in the northeastern-eastern sky was very bright. The dominating NLC forms were veil (I), sharp bands (IIb) and short and straight waves (IIIa). These late-July NLC displays are usually very nice to observe, because the background sky is already getting darker, and the NLC’s stand out very clearly from the sky!


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