Abstract: It is known that noctilucent clouds were first observed in 1885, two years after the great Krakatoa eruption in the Sunda Straits. The preeminent question of whether noctilucent clouds appeared before 1885 is studied here ...

Abstract: Extracts from Otto Jesse's papers relating to twilight studies, noctilucent clouds, and atmospheric movements are presented here to illustrate his contribution to the subject during the years 1884?1901. The most important ...

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