The Nightglow Spectrum of Jupiter as seen by the Alice UV Spectrograph on New Horizons

We present the nightside spectrum of Jupiter as seen by the New Horizons Alice UV spectrograph seen after the flyby of March 3, 2007. New Horizons completed four back-to-back scans of the nightside disk. The nightglow spectrum, presented here, is considerably fainter than the nightglow spectrum observed by the Voyager UVS instrument. The Lyman-α brightness during the Voyager mission was variable across the disk and was as bright as 1 kR. The Lyman-α brightness as observed with New Horizons is largely constant across the nightside disk at ∼ 240 R.We also compare the New Horizons nightglow spectra to spectral models of the Lyman andWerner bands in order to examine possible sources of the nightglow emission.