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dc.contributor.authorMorales-Juberias, R.-
dc.contributor.authorSayanagi, K. M.-
dc.contributor.authorSimon, A. A.-
dc.contributor.authorFletcher, Leigh Nicholas-
dc.contributor.authorCosentino, R. G.-
dc.identifier.citationAstrophysical Journal Letters, 2015, 806, L18en
dc.description.abstractThe Voyager flybys of Saturn in 1980–1981 revealed a circumpolar Hexagon at ~78° north planetographic latitude that has persisted for over 30 Earth years, more than one Saturn year, and has been observed by ground-based telescopes, Hubble Space Telescope and multiple instruments on board the Cassini orbiter. Its average phase speed is very slow with respect to the System III rotation rate, defined by the primary periodicity in the Saturn Kilometric Radiation during the Voyager era. Cloud tracking wind measurements reveal the presence of a prograde jet-stream whose path traces the Hexagon's shape. Previous numerical models have produced large-amplitude, n = 6, wavy structures with westward intrinsic phase propagation (relative to the jet). However, the observed net phase speed has proven to be more difficult to achieve. Here we present numerical simulations showing that instabilities in shallow jets can equilibrate as meanders closely resembling the observed morphology and phase speed of Saturn's northern Hexagon. We also find that the winds at the bottom of the model are as important as the winds at the cloud level in matching the observed Hexagon's characteristics.en
dc.publisherAmerican Astronomical Societyen
dc.rightsCopyright © 2015. The American Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.en
dc.subjectplanets and satellites: atmospheresen
dc.subjectplanets and satellites: generalen
dc.subjectplanets and satellites: physical evolutionen
dc.titleMeandering Shallow Atmospheric Jet as a Model of Saturn's North-Polar Hexagonen
dc.typeJournal Articleen
dc.description.versionPublisher Versionen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERINGen
pubs.organisational-group/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomyen
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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