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- W1986955963 abstract "We report infrared heterodyne spectroscopy (λ/Δλ ∼ 10 6 ) of C 2 H 6 emission at 11.9 μm from the northern Jovian auroral region, in observations conducted over December 2–7, 1989. Accurately measured line shapes provide information on C 2 H 6 abundance as well as temperature and permit retrieval of the source pressure region. Enhanced emission was observed in the longitude range ∼150°–180° at ∼60° north latitude, approximately corresponding to the CH 4 7.8‐μm hot spot and the region of brightest UV aurora. Significant brightness variations were observed in the hot spot emissions on a time scale of ∼20 hours. Analysis of the brightest hot spot spectra indicates C 2 H 6 mole fractions of ∼(6.3–6.8) × 10 −6 at temperatures of ∼182–184 K at 1 mbar, compared to mole fractions of (3.8 ± 1.4) × 10 −6 averaged over spectra outside the hot spot at a temperature of ∼172 K at the same pressure. Fixing the mole fraction to the lower limit retrieved in the quiescent (non‐hot spot) region allows the temperature at 1 mbar to be as high as ∼200 K within the hot spot. These results provide upper limits to the temperature increase near the source of the C 2 H 6 thermal infrared emission. Combined with results from similar measurements of ethylene emission probing the ∼10‐μbar region (Kostiuk et al., this issue), altitude information on the thermal structure of the Jovian auroral stratosphere can be obtained for the first time." @default.
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- W1986955963 date "1993-10-25" @default.
- W1986955963 modified "2023-09-26" @default.
- W1986955963 title "Temperature and abundances in the Jovian auroral stratosphere: 1. Ethane as a probe of the millibar region" @default.
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- W1986955963 doi "https://doi.org/10.1029/93je01043" @default.
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