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Title: Jupiter's Mesoscale Waves Observed at 5 mu m by Ground-based Observations and Juno JIRAM
Authors: Fletcher, Leigh N.
Melin, H.
Adriani, A.
Simon, A. A.
Sanchez-Lavega, A.
Donnelly, P. T.
Antuñano, A.
Orton, G. S.
Hueso, R.
Kraaikamp, E.
Wong, M. H.
Barnett, M.
Moriconi, M. L.
Altieri, F.
Sindoni, G.
First Published: 26-Jul-2018
Publisher: American Astronomical Society, IOP Publishing
Citation: Astronomical Journal, 2018, 156 (2)
Abstract: We characterize the origin and evolution of a mesoscale wave pattern in Jupiter's North Equatorial Belt (NEB), detected for the first time at 5 μm using a 2016–17 campaign of "lucky imaging" from the VISIR instrument on the Very Large Telescope and the NIRI instrument on the Gemini observatory, coupled with M-band imaging from Juno's JIRAM instrument during the first seven Juno orbits. The wave is compact, with a 1fdg1–1fdg4 longitude wavelength (wavelength 1300–1600 km, wavenumber 260–330) that is stable over time, with wave crests aligned largely north–south between 14°N and 17°N (planetographic). The waves were initially identified in small (10° longitude) packets immediately west of cyclones in the NEB at 16°N but extended to span wider longitude ranges over time. The waves exhibit a 7–10 K brightness temperature amplitude on top of an ~210 K background at 5 μm. The thermal structure of the NEB allows for both inertio-gravity waves and gravity waves. Despite detection at 5 μm, this does not necessarily imply a deep location for the waves, and an upper tropospheric aerosol layer near 400–800 mbar could feature a gravity wave pattern modulating the visible-light reflectivity and attenuating the 5-μm radiance originating from deeper levels. Strong rifting activity appears to obliterate the pattern, which can change on timescales of weeks. The NEB underwent a new expansion and contraction episode in 2016–17 with associated cyclone–anticyclone formation, which could explain why the mesoscale wave pattern was more vivid in 2017 than ever before.
DOI Link: 10.3847/1538-3881/aace02
ISSN: 0004-6256
eISSN: 1538-3881
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2018, American Astronomical Society, IOP Publishing. Deposited with reference to the publisher’s open access archiving policy. (
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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