vrijdag 26 juni 2009

Noctilucent clouds

Under optimal conditions so called "noctilucent clouds" can be seen over Holland. These clouds-like phenomenon are made of crystals of water ice. They are normally too faint to be seen, and are visible only when illuminated by sunlight from below the horizon while the lower layers of the atmosphere are in the Earth's shadow.To photograph this phenomenon I went to a wetland called Bargerveen, where it's quiet and there's no light-pollution. I made the composition and had to use long exposure, which turned out very well.

The next wish is the aurora borealis, but we'll have to wait another 2 years when there's a peak of the eleven-year sunspot cycle.

Noctilucent clouds; Canon 30D w. 17-40mm @17mm; Av22 Tv13" iso100 manual