MI
Meteorological Institute
Photo: UHH, MPI-M
17 June 2020
Photo: Jon Petersen
The Noctilucent cloud (NLC) season has started! These clouds can be observed from now until late August at night time if conditions are favourable.
Noctilucent clouds are mesospheric ice clouds that occur at high latitudes in the summer hemisphere and are just visible when the sun is 6 to 12 degrees below the horizon. They are indicators of various dynamical phenomena in the atmosphere, because the formation of those clouds cannot be explained just by radiation effects.