Noctilucent clouds – the clouds that have nothing to do with the weather
Anyone who look north yesterday evening around 11 p.m. with a clear horizon would probably have seen them – the noctilucent clouds (NLC) in the sky. The special thing about this type of cloud is the region in which it occurs, namely at an altitude of 80 to 85 kilometers! This means that they are far above the weather layer (troposphere), which in our latitudes extends up to 10 to 15 kilometers depending on the time of year. For successful observation, it is of course still an advantage if the conditions are as cloud-free as possible.
observation times
Noctilucent clouds can only be seen some time after sunset or before sunrise, when the sun is around 6 to 16 degrees below the horizon. This is about one to two hours after sunset or before sunrise. At this time, the Earth’s atmosphere is in shadow and it is relatively dark; only the noctilucent clouds at high altitudes are illuminat by the sun and can be easily observ.
Almost exactly four years ago, beautiful glowing south korea mobile database noctilucent clouds appear in the Swiss sky. Meteorologist Matthias Sänger was able to record a beautiful time-lapse video of this impressive phenomenon:
Sources and further information:
At the end of June we receiv the following video, with a request for an explanation of the film luminous phenomenon (source: Falko Heymans. Many thanks for permission to use it):
This is a “crown flash” or in the German how to build a cohesive brand experience translation a “crown flash” or a “crowning bundle of light”.
The optical phenomenon occurs in rare cases at the top of storm betting email list clouds in the form of a beam of light moving back and forth. It was first mention in 1971 in an article in the magazine Nature (see below).
There is currently no reliable scientific explanation for the phenomenon. It is assum that the beam of light is creat by reflection and possibly refraction of sunlight on ice crystals at the upper ge of the storm clouds. The ice crystals are align by the electric field in the storm cloud. With each lightning discharge, the electric field changes, which may explain the abrupt movements of the beam of light.