Extreme ultraviolet auroral spectra have been obtained in the wavelength range of 750--1230 A resolution with a rocket-borne grating spectrometer. Atomic emissions of NI, NII, OI and OII are the dominant features along with geocoronal HI Lyman &agr;. N2 emission bands, which appear strongly in laboratory electron impact spectra, appear only as a modest background continuum between 900 to 1100 A. The observed intensities are consistent with electron impact excitation of O and N2. For optically thick emissions, such as N I &lgr;1200, radiation transport along the arc results in an intensity enhancement when viewed through the arc towards he zenith. |