We have obtained the first spectrum of the tropical airglow in the 800--1400 ¿ range. The data were obtained at 8 ¿ resolution by the EUV spectrometer on board the STP78-1 satellite. The time-averaged downlooking spectrum within the arc shows strong OI features at 1304 and 1356 ¿. We have detected the oxygen recombination continuum at 911 ¿, which provides the first conclusive evidence that radiative recombination is the primary excitation mechanism for the tropical ultraviolet emissions. We have also discovered a weak OI 989 ¿ emission from the tropical arc region, which is not expected in ordinary radiative recombination spectrum. Such observation indicates that other processes, such as dielectronic recombination or mutual neutralization, might be present in these regions.