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Further studies of the spectral data obtained in the February 1960 rocket experiment [ Ann. Geophys.17, 109 ( 1961)] have confirmed much of the preliminary analysis. New bands of the Lyman–Birge–Hopfield system in the 1700–2200 Å region have been identified. More precise wavelength determinations have been made, and previously indicated bands of N_2 have been more positively identified. The Lyman α line of hydrogen is just detectable. The intensity distribution among the various bands during weak auroral conditions is shown to differ markedly from more intense displays. Laboratory data obtained from a microwave discharge in very pure N_2 show good correlation with some features of the rocket spectra.

A new scanning spectrometer is described herein which is based almost exclusively on very recent technological advances and which, over the ultraviolet, visible, and near infrared region to 6 microns is capable of resolution and wavelength measuring accuracy comparable, on a wave-number basis, with the best that has been accomplished with spectrographs limited to the photographic region. The instrument is of the Ebert type and employs gratings as large as 5×7 inches, has a focal length of 72 inches, uses circularly curved slits 2 inches long, and can be triple passed. Specifications and performance are outlined.