Explanation: It's northern noctilucent cloud season. Composed of small ice crystals forming only during specific conditions in the upper atmosphere, noctilucent clouds may become visible at sunset during late summer when illuminated by sunlight from below. Noctilucent clouds are the highest clouds known and now established to be polar mesospheric clouds observed from the ground. Although observed with NASA's AIM satellite since 2007, much about noctilucent clouds remains unknown and so a topic of active research. The featured image shows expansive and rippled noctilucent clouds wafting over Paris, France. This year, several northern locations are already reporting especially vivid displays of noctilucent clouds.

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Authors & editors: Robert Nemiroff (MTU) & Jerry Bonnell (USRA)
NASA Web Site Statements, Warnings, and Disclaimers
NASA Official: Jay Norris. Specific rights apply.
A service of: LHEA at NASA / GSFC
& Michigan Tech. U.

Publikacii s klyuchevymi slovami: noctilucent clouds - Serebristye oblaka Publikacii so slovami: noctilucent clouds - Serebristye oblaka
Sm. takzhe: Serebristye oblaka nad Floridoi Severnye letnie sumerki Serebristye oblaka i kometa NEOWISE Nebesnye veny Noch' solncestoyaniya v Parizhe Serebristye oblaka, otrazheniya i siluety Serebristye oblaka nad parizhskim feierverkom Vse publikacii na tu zhe temu >>