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Mapping the zonal winds of Jupiter’s stratospheric equatorial oscillation

hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierASP 2021
dc.contributor.authorBENMAHI, B.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierASP 2021
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics [LESIA]
dc.contributor.authorCAVALIÉ, T.
hal.structure.identifierSouthwest Research Institute [San Antonio] [SwRI]
dc.contributor.authorGREATHOUSE, T.
hal.structure.identifierSouthwest Research Institute [San Antonio] [SwRI]
dc.contributor.authorHUE, V.
hal.structure.identifierSouthwest Research Institute [San Antonio] [SwRI]
dc.contributor.authorGILES, R.
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorGUERLET, S.
hal.structure.identifierLaboratoire de Météorologie Dynamique (UMR 8539) [LMD]
dc.contributor.authorSPIGA, A.
hal.structure.identifierDepartment of Astronomy [College Park]
dc.contributor.authorCOSENTINO, R.
dc.date.issued2021-08
dc.identifier.issn0004-6361
dc.description.abstractEnContext. Since the 1950s, quasi-periodic oscillations have been studied in the terrestrial equatorial stratosphere. Other planets of the Solar System present (or are expected to present) such oscillations; for example the Jupiter equatorial oscillation and the Saturn semi-annual oscillation. In Jupiter’s stratosphere, the equatorial oscillation of its relative temperature structure about the equator is characterized by a quasi-period of 4.4 yr. Aims. The stratospheric wind field in Jupiter’s equatorial zone has never been directly observed. In this paper, we aim to map the absolute wind speeds in Jupiter’s equatorial stratosphere in order to quantify vertical and horizontal wind and temperature shear. Methods. Assuming geostrophic equilibrium, we apply the thermal wind balance using almost simultaneous stratospheric temperature measurements between 0.1 and 30 mbar performed with Gemini/TEXES and direct zonal wind measurements derived at 1 mbar from ALMA observations, all carried out between March 14 and 22, 2017. We are thus able to self-consistently calculate the zonal wind field in Jupiter’s stratosphere where the JEO occurs. Results. We obtain a stratospheric map of the zonal wind speeds as a function of latitude and pressure about Jupiter’s equator for the first time. The winds are vertically layered with successive eastward and westward jets. We find a 200 m s −1 westward jet at 4 mbar at the equator, with a typical longitudinal variability on the order of ~50 m s −1 . By extending our wind calculations to the upper troposphere, we find a wind structure that is qualitatively close to the wind observed using cloud-tracking techniques. Conclusions. Almost simultaneous temperature and wind measurements, both in the stratosphere, are a powerful tool for future investigations of the JEO (and other planetary equatorial oscillations) and its temporal evolution.
dc.description.sponsorshipUn modèle commun pour comprendre les atmosphères des géantes gazeuses - ANR-17-CE31-0007
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enplanets and satellites: atmospheres, planets and satellites: gaseous planets, planets and satellites: individual: Jupiter
dc.title.enMapping the zonal winds of Jupiter’s stratospheric equatorial oscillation
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/202141523
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageA125
bordeaux.volume652
bordeaux.peerReviewedoui
hal.identifierhal-03358143
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03358143v1
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