The Astrophysical Journal · 1974 · 95 citations · 0 references
Natural SciencesAstronomyPhysicsAstrophysicsSolar AstronomyUltraviolet AstronomySolar Active RegionsSolar ChromosphereSolar CoronaSolar PhotosphereSolar ProminencesSolar Ultraviolet EmissionActive Region ChromosphereCoronal ObservationsCoronal Ultraviolet EmissionExtreme Ultraviolet Solar ObservationsFar Ultraviolet ObservationsSolar Corona PhysicsSolar Corona Ultraviolet EmissionSolar Ultraviolet Observations
We compare the appearance and physical parameters of the solar chromosphere, transition zone, and corona in areas of coronal holes with that of quiet areas outside the hole. Measurements of the height of emission of various ions in a coronal hole appearing at the polar limb give a quantitative indication of the increased thickness of the transition zone underlying coronal holes.