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Instantaneous Pole Velocity and Global Models

S. A. IvanovS. A. MerkuryevI. M. Demina
Dec 2022
摘要
A new approach to estimating the velocity of the pole moving is considered.The method uses the model-calculated spatial distribution of the (vector)horizontal component \textbf{H} for a given year and its change relative to theclosest epochs. The velocity equation is obtained from the expression for thetime dependence of the position of the pole$\mathbf{H}(\lambda(t),\phi(t),t)=0$. Here $\lambda(t)$ and $\phi(t)$ are thegeographic coordinates of the pole at time $t$. The velocity between epochs canbe found using the Hermite spline, which gives a smooth line that keeps thevelocity vector in each epoch. We use IGRF and COV-OBSx2 models to find thehorizontal component.
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