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- W2108695961 abstract "We measured in thermal emission the 63‐μm line due to thermospheric atomic oxygen O( 3 P ), using a far‐infrared spectrometer on a balloon platform at 37 km altitude over Palestine, Texas (32°N), on June 20, 1983. From measurements of the equivalent width of this line at two elevation angles, we find a weak angular dependence: the equivalent width increases by a factor of 1.5 ±0.3 as the angle decreases from +30° to +1°. Since the optical depth of the O( 3 P ) line is large, we cannot directly convert the measured line intensity to a column abundance. Instead, we interpret the measurements in terms of radiative transfer through a 16‐layer atmosphere extending to 200 km. We use a model atmosphere for summer at 30°N, with an exospheric temperature of 1300 K, including (1) an assumed daytime atomic oxygen abundance profile constructed from recent chemical and dynamical models and (2) a water vapor abundance profile constructed from recent experimental and model results. For this assumed O( 3 P ) vertical profile shape we determine from our spectra at two elevation angles a multiplicative scaling factor of 0.8, with an altitude‐dependent uncertainty. In the best‐determined layer the uncertainty in the multiplier is ±0.2 at 119 km. The model‐dependent peak atomic oxygen density is 3.6 (±1.9) × 10 11 cm −3 at an altitude of about 101 km." @default.
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- W2108695961 date "1987-04-20" @default.
- W2108695961 modified "2023-09-26" @default.
- W2108695961 title "Atomic oxygen in the lower thermosphere" @default.
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- W2108695961 doi "https://doi.org/10.1029/jd092id04p04325" @default.
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