Nature · 1936 · 12 citations · 0 references
Natural SciencesAstronomyPhysicsAtmospheric RadiationAtmospheric ScienceSpectroscopyAtmospheric OpticsEmission SpectroscopySolar ChromosphereSolar RadiationSpectral Line AstronomySpectral RadiationAuroral PhysicsChromospheric Emission LinesEmission Line SpectroscopyH Ii Region Emission LinesRed LinesSolar Emission LinesUltraviolet Absorption Lines