Mother-of-pearl clouds
A mostly paste1-coloured iridescence on small ice crystals of lenticular clouds at altitudes between 20 and 30 km is called mother-of-pearl clouds.
They are visible best a short time before sunset respectively after sunrise at a distance of 10 ° to 20 ° from the sun.
www.meteoros.dePerlmutterwolken
Als Perlmutterwolken beschreibt man ein meist pastellfarbenes Irisieren an kleinsten Eiskristallen linsenförmiger Wolken in 20 bis 30 km Höhe.
Ihre beste Sichtbarkeit erreichen sie kurz vor Sonnenuntergang bzw. kurz nach Sonnenaufgang in 10 bis 20 ° Entfernung von der Sonne.
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