An emission feature at 1026-¿ observed at 600 km in the dayglow with a spectrometer on board the STP 78-1 spacecraft cannot be explained by geocoronal hydrogen Lyman &bgr;. An accadental resonance of some lines of the O I multiplet at 1026-¿ with the broad solar Lyman &bgr; line can in fact account for the observed emission rate, based on analysis with a Monte Carlo radiative transport model. Photoelectron excitation of atomic oxygen is negligible compared with resonant scattering. These airglow results support a ratio of 66 to 1 for the solar Lyman &agr; to Lyman &bgr; line center fluxes. ¿ American Geophysical Union