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- W2019462034 abstract "We report on high-resolution and spatially-resolved spectra of Io in the 4.0 μm region, recorded with the VLT/CRIRES instrument in 2008 and 2010, which provide the first detection of the ν1 + ν3 band of SO2 in Io’s atmosphere. Data are analyzed to constrain the latitudinal, longitudinal, and diurnal distribution of Io’s SO2 atmosphere as well as its characteristic temperature. Equatorial SO2 column densities clearly show longitudinal asymmetry, but with a maximum of ∼1.5 × 1017 cm−2 at central meridian longitude L = 200–220 and a minimum of ∼3 × 1016 cm−2 at L = 285–300, the longitudinal pattern somewhat differs from earlier inferences from Ly α and thermal IR measurements. Within the accuracy of the measurements, no evolution of the atmospheric density from mid-2008 to mid-2010 can be distinguished. The decrease of the SO2 column density towards high latitudes is apparent, and the typical latitudinal extent of the atmosphere found to be ±40° at half-maximum. The data show moderate diurnal variations of the equatorial atmosphere, which is evidence for a partially sublimation-supported atmospheric component. Compared to local noon, factor of 2 lower densities are observed ∼40° before and ∼80° after noon. Best-fit gas temperatures range from 150 to 220 K, with a weighted mean value of 170 ± 20 K, which should represent the column-weighted mean kinetic temperature of Io’s atmosphere. Finally, although the data include clear thermal emission due to Pillan (in outburst in July 2008) and Loki, no detectable enhancements in the SO2 atmosphere above these volcanic regions are found, with an upper limit of 4 × 1016 cm−2 at Pillan and 1 × 1017 cm−2 at Loki." @default.
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- W2019462034 date "2015-06-01" @default.
- W2019462034 modified "2023-10-13" @default.
- W2019462034 title "Detection and characterization of Io’s atmosphere from high-resolution 4-μm spectroscopy" @default.
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- W2019462034 doi "https://doi.org/10.1016/j.icarus.2015.02.018" @default.
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