1911 Encyclopædia Britannica/Coronium
CORONIUM, that constituent (otherwise unknown) of the sun’s corona, which emits the characteristic green coronal ray, of which the wave-length is 5303.
See also Coronium on Wikipedia; and our 1911 Encyclopædia Britannica disclaimer.
CORONIUM, that constituent (otherwise unknown) of the sun’s corona, which emits the characteristic green coronal ray, of which the wave-length is 5303.