Noctilucent clouds on Jun 16, 2020

The Noctilucent clouds (NLCs) where captured with a sky surveillance camera and a digital photo camera after sunset on Jun 16, 2020.

NLC's are are Earth's highest clouds and occur in altitudes of about 80 km to 85 km. These clouds consists in tiny ice crystals of up to 100nm. NLC's are too faint to be seen in daylight and they are only visible if the sun is between 6° and 16° below horizon. Then the NLC's are illuminated by sunlight while lower layer of the atmosphere are in shadow and sky becomes dark.

The moving filaments that can be seen in the video are caused by gravity waves, the same type of waves which occur if you drop a stone into a pool af water.

Stills and video from photo camera pointing to north

High resolution images of the NLC display has been taken with a digital photo camera with fish-eye lens. The begin of the event has not been captured with this camera.

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Sky surveillance camera pointing to north

The entire display was recorded with a sky surveillance camera pointing to north.

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Observation data:

Date:	Jun 16, 2020 between 22:05 and 23:55 CEST (=UTC+2h)
Location:	Pulsnitz, Germany
Instrument:	APS-C digital photo camera with fish-eye lens and sky surveillance camera