核分裂後のキノコ雲

Castle Bravo：on Feb28,1954

the first in a series of high-yield thermonuclear weapon design tests conducted by the United States at Bikini Atoll, Marshall Islands, as part of Operation Castle.
（from you-tube TalkWidTech）

核分裂後のキノコ雲の映像は直後の青い光からオレンジ色に変化していく
特徴があります。