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Altocumulus Lenticularis (Ac len)
Called the beautiful altocumulus clouds Lenticularis, or lens clouds or UFO-clouds I have observed in New Zealand. The clouds are stationary in the sky.
Noctilucent Clouds
In the summer months luminescent clouds can be seen in the northern regions. Have a height of about 80 kilometers. These are the highest clouds, which are still lit by the sun in the summer.