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Subseasonal Variation in Neptune’s Mid-infrared Emission

Title	Subseasonal Variation in Neptune’s Mid-infrared Emission
Authors	Michael T. Roman, Leigh N. Fletcher, Glenn S. Orton, Thomas K. Greathouse, Julianne I. Moses, Naomi Rowe-Gurney, Patrick G. J. Irwin, Arrate Antuñano, James Sinclair, Yasumasa Kasaba, Takuya Fujiyoshi, Imke de Pater, Heidi B. Hammel
Magazine	The Planetary Science Journal
Date	04/11/2022
DOI	10.3847/PSJ/ac5aa4
Introduction	This study provides an examination of all accessible ground-based mid-infrared imaging data of Neptune, spanning from 2003 to 2020. These observations document alterations in Neptune's mid-infrared emission (approximately 8–25 μm) during the period surrounding its 2005 southern summer solstice. Imagery attuned to stratospheric ethane (∼12 μm), methane (∼8 μm), and CH3D (∼9 μm) exhibits notable subseasonal temporal shifts at both regional and global extents. A correlation with H2S(1) hydrogen quadrupole (∼17.035 μm) spectra indicates that these variations are predominantly linked to changes in stratospheric temperature. The stratosphere showed a cooling trend from 2003 to 2009 across various filtered wavelengths, followed by a substantial warming of the south pole between 2018 and 2020. In contrast, upper-tropospheric temperatures, deduced from ∼17 to 25 μm imaging, remained consistent during this timeframe, with the exception of the south pole, which registered its highest temperatures from 2003 to 2006. The paper considers the observed variability concerning seasonal influences, tropospheric atmospheric conditions, and the solar cycle. These accumulated data provide evidence that processes generate subseasonal variations throughout Neptune's stratosphere on both global and localized scales.
Quote	Michael T. Roman, Leigh N. Fletcher and Glenn S. Orton et al. Subseasonal Variation in Neptune’s Mid-infrared Emission. Planet. Sci. J. 2022. Vol. 3(4):78. DOI: 10.3847/PSJ/ac5aa4
Element	Carbon (C) , Hydrogen (H) , Sulfur (S)
Industry	Space , Research & Laboratory , Optics

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