000006677 001__ 6677
000006677 005__ 20240126141401.0
000006677 0247_ $$2DOI$$a10.3847/PSJ/acee77
000006677 037__ $$aSCART-2024-0048
000006677 100__ $$aSeuren, Fleur
000006677 245__ $$aEffects of the Librationally Induced Flow in Mercury’s Fluid Core with an Outer Stably Stratified Layer
000006677 260__ $$c2023
000006677 520__ $$aObservational constraints on Mercury's thermal evolution and magnetic field indicate that the top part of the fluid core is stably stratified. Here we compute how a stable layer affects the core flow in response to Mercury's main 88 day longitudinal libration, assuming various degrees of stratification, and study whether the core flow can modify the libration amplitude through viscous and electromagnetic torques acting on the core–mantle boundary (CMB). We show that the core flow strongly depends on the strength of the stratification near the CMB but that the influence of core motions on libration is negligible with or without a stably stratified layer. A stably stratified layer at the top of the core can, however, prevent resonant behavior with gravito-inertial modes by impeding radial motions and promote a strong horizontal flow near the CMB. The librationally driven flow is likely turbulent and might produce a nonaxisymmetric induced magnetic field with a strength of the order of 1% of Mercury's dipolar field.
000006677 536__ $$aH2020/$$c855677/$$fGRACEFUL
000006677 594__ $$aNO
000006677 6531_ $$aMercury (planet)
000006677 6531_ $$aLibration
000006677 6531_ $$aAstrophysical Fluid Dynamics
000006677 6531_ $$aInternal Waves
000006677 6531_ $$aMagnetic fields
000006677 700__ $$aTriana, Santiago
000006677 700__ $$aRekier, Jérémy
000006677 700__ $$aBarik, Ankit
000006677 700__ $$aVan Hoolst, Tim
000006677 773__ $$c161$$n9$$pThe Planetary Science Journal$$v4$$y2023
000006677 8560_ $$ffleur.seuren@ksb-orb.be
000006677 85642 $$ahttps://iopscience.iop.org/article/10.3847/PSJ/acee77/meta
000006677 8564_ $$s2396295$$uhttp://publi2-as.oma.be/record/6677/files/seuren2023effects.pdf
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000006677 905__ $$apublished in
000006677 980__ $$aREFERD