彩さい球きゅうMeanings1nounchromosphereastronomyAstronomical term for the layer of the sun's atmosphere above the photosphere. Related to 彩層 (chromosphere).See also: 彩層彩さい球きゅうは太たい陽ようの彩さい層そうの一いち部ぶを指さすことがある。彩球 can refer to a part of the sun's chromosphere.