Thermonuclear bomb test at Novaya Zemlya

A hydrogen bomb test at Novaya Zemlya, 1957-1962. This scene is taken from a Soviet film called Ядерное оружие в готовности к применению (it is on youtube), in which this explosion is shown as one of a series of two nuclear tests with R-12 rockets (the Operation Roza, September 12th and 16th, 1961). This explosion is most surely not from the Operation Roza, because the two nuclear tests during these experiments occurred in overcast/rainy weather (ref. below). There are better quality versions of this footage circulating on internet where it can be clearly seen that this explosion occurred in a clear sky with some faint clouds (I selected this version because is the most complete I've seen). I'm aware there is a clip of this same explosion in a video library whose description mentions this occurred in 1957. I'm not aware of any reference to such information in any film that I've seen where this footage appears (the documentary film where that clip in particular was taken from was done way after soviet atmospheric testing ended and nothing is said about the explosion), so although that is perfectly possible I wouldn't take that info seriously. Ref: The article «Роза» советского Заполярья. Исторический опыт проведения натурных испытаний стратегического ракетно-ядерного оружия в период Берлинского кризиса 1961 года. Available on internet. #nuclearweapons #coldwar #sovietunion #soviet #history