Journal articles
Viscomagnetic torque at the core mantle boundary
Abstract : A magneto-hydrodynamic model of boundary layers at the core–mantle boundary (CMB) is derived and used to compute the viscous and electromagnetic torques generated by the Earth's nutation forcing. The predicted electromagnetic torque alone cannot account for the dissipation estimated from the observations of the free core nutation. The presence of a viscous boundary layer in the electromagnetic skin layer at the CMB, with its additional dissipative torques, may explain the geodetic data. An apparent Ekman number at the top of the core between 2 and 4 × 10−11 is inferred depending on the electrical conductivity of the mantle.
https://hal-insu.archives-ouvertes.fr/insu-00266167
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Submitted on : Wednesday, March 10, 2021 - 3:42:28 PM
Last modification on : Tuesday, October 19, 2021 - 6:58:01 PM
Long-term archiving on: : Friday, June 11, 2021 - 7:03:37 PM
Contributor : Pascale Talour Connect in order to contact the contributor
Submitted on : Wednesday, March 10, 2021 - 3:42:28 PM
Last modification on : Tuesday, October 19, 2021 - 6:58:01 PM
Long-term archiving on: : Friday, June 11, 2021 - 7:03:37 PM
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