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Qu'est-ce (qui) est noctilucent clouds - définition

HIGHLY-ELEVATED CLOUD-LIKE ICE CRYSTALS IN THE UPPER ATMOSPHERE OF EARTH VISIBLE DURING ASTRONOMICAL TWILIGHT

Polar mesospheric cloud; Noctilucent clouds; Polar mesospheric clouds; Mesospheric cloud; Mesospheric clouds; Noctilucent; Polar Mesospheric Clouds; Noctilucent Cloud; Noctilucence; Noctiluscent cloud; Night-shining cloud; Night shining cloud

noctilucent cloud

[?n?kt?'lu:s(?)nt]

¦ noun a high, luminous cloud seen at night, especially in summer in high latitudes.

Origin

C19: from L. nox, noct- 'night' + lucere 'to shine' + -ent.

Noctilucent cloud

Noctilucent clouds, or night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere of Earth. When viewed from space, they are called polar mesospheric clouds (PMCs), detectable as a diffuse scattering layer of water ice crystals near the summer polar mesopause.

https://en.wikipedia.org/wiki/Noctilucent_cloud

The Clouds

COMEDY BY ARISTOPHANES

Nephelai; Phronistery; Phrontistery; The Phrontistery; The Clouds of Aristophanes; Νεφέλαι; Strepsiades; Clouds (Aristophanes); Nephelae

The Clouds ( Nephelai) is a Greek comedy play written by the playwright Aristophanes. A lampooning of intellectual fashions in classical Athens, it was originally produced at the City Dionysia in 423BC and was not as well received as the author had hoped, coming last of the three plays competing at the festival that year.

https://en.wikipedia.org/wiki/The_Clouds

Wikipédia

Noctilucent cloud

Noctilucent clouds, or night shining clouds, are tenuous cloud-like phenomena in the upper atmosphere of Earth. When viewed from space, they are called polar mesospheric clouds (PMCs), detectable as a diffuse scattering layer of water ice crystals near the summer polar mesopause. They consist of ice crystals and from the ground are only visible during astronomical twilight. Noctilucent roughly means "night shining" in Latin. They are most often observed during the summer months from latitudes between ±50° and ±70°. Too faint to be seen in daylight, they are visible only when the observer and the lower layers of the atmosphere are in Earth's shadow, but while these very high clouds are still in sunlight. Recent studies suggest that increased atmospheric methane emissions produce additional water vapor once the methane molecules reach the mesosphere – creating, or reinforcing existing noctilucent clouds. These clouds can last hundreds of years in the atmosphere, and are sometimes referred to as fossilized clouds because of their age.

They are the highest clouds in Earth's atmosphere, located in the mesosphere at altitudes of around 76 to 85 km (249,000 to 279,000 ft).

https://en.wikipedia.org/wiki/Noctilucent cloud