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- W2096051817 abstract "A model of the earth's liquid core is assumed in which the underlying magnetic field and velocity are zonal and axially symmetric. Alfvén waves that vary as e i ( k ϕ−σ t ) are considered, where ϕ is the angle of longitude. Buoyancy and Coriolis forces Ω × U are included. For a wide class of basic states and regions of flow, it is shown that roughly as many of the waves with a given k [ges ] 2 propagate eastwards as propagate westwards. All these waves are neutrally stable. The class of basic states is restricted by certain inequalities involving their velocity, magnetic field and entropy gradient. it is observed that the known equivalence (Malkus 1967) between Alfvén waves with frequencies σ [Lt ] Ω and inertial waves with frequencies σ p which are O (Ω) still holds when buoyancy forces are present. The equivalence requires σ p 2 to be real. If σ p is pure imaginary, as is possible (though perhaps uncommon) in an unstably stratified medium, then the corresponding Alfvén wave is not neutrally stable and travels westwards." @default.
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- W2096051817 date "1977-09-07" @default.
- W2096051817 modified "2023-09-26" @default.
- W2096051817 title "A note on the westward drift of the earth's magnetic field" @default.
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- W2096051817 doi "https://doi.org/10.1017/s002211207700072x" @default.
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