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- W2029147524 abstract "We have reanalyzed the 190‐ to 250‐nm nightglow spectrum of Venus recorded by the Pioneer Venus Orbiter. This spectrum is known to consist primarily of v ′ = 0 features of the NO δ‐ and γ‐bands. However, the summed spectra, taken over many orbits, have weak and previously unidentified bands in the same spectral region, which we interpret as originating from higher vibrational levels of NO( A 2 Σ + ), resulting from collisional relaxation of NO( C 2 Π) v = 0. The intensity of the airglow is quite variable, with the average number of photon counts in a spectral scan being 3, while the maximum counts observed is 65. We divided the scans into a high‐count group and a low‐count group. The resulting partial‐sum spectra and the wide intensity variations suggest that at least two sources of excitation are operating. The low‐count spectrum looks similar to an N + O afterglow spectrum taken at relatively high pressure, containing a variety of relaxed NO states, and thus appears to have been generated at low altitude. The high‐count spectrum is unrelaxed, and resembles a photoexcitation spectrum of the C 2 Π ( v = 0) state, and thus would reflect N + O recombination at higher altitudes. Of particular interest is a set of three consecutive intense spectra taken on the same orbit, which suggests the presence of a long (1000 km), straight, and narrow (∼5 km) track of secondary NO excitation, possibly caused by a meteor." @default.
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- W2029147524 date "1993-06-25" @default.
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- W2029147524 title "New perspectives on the Venus nightglow" @default.
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- W2029147524 doi "https://doi.org/10.1029/93je00997" @default.
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