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• W2098324443 endingPage "50" @default.
• W2098324443 startingPage "28" @default.
• W2098324443 abstract "At observatory locations, the Earth’s magnetic field displays an almost constant secular acceleration, except at times of geomagnetic jerks when this quantity suddenly changes its value. The 2003 geomagnetic jerk was the first to have been recorded globally and uniformly over the Earth, and is well captured by time-varying spherical harmonic models of the geomagnetic field, based on satellite data. We jointly derive instantaneous estimates of the core surface flow and acceleration accounting for the field secular variation and acceleration given by such models. We consider epochs just before and after the 2003 event and show that no steady flow, no matter how general, can simultaneously account for the observed secular variation and acceleration at either epoch. Assuming the flow to be tangentially geostrophic, we next show that even purely toroidal zonal flow accelerations cannot account for the observed secular acceleration and conclude that more general tangentially geostrophic flow accelerations are required by the data. These flow accelerations, however, may well be equatorially symmetric, as predicted by theoretical considerations. Investigating the flow acceleration change throughout the 2003 event shows that these also may be equatorially symmetric, but definitely not purely toroidal zonal. This unambiguously confirms earlier suggestions that the 2003 geomagnetic jerk was a more complex phenomena than a simple consequence of torsional oscillations." @default.
• W2098324443 created "2016-06-24" @default.
• W2098324443 creator A5062996487 @default.
• W2098324443 creator A5090737471 @default.
• W2098324443 date "2012-05-01" @default.
• W2098324443 modified "2023-10-04" @default.
• W2098324443 title "Investigating the 2003 geomagnetic jerk by simultaneous inversion of the secular variation and acceleration for both the core flow and its acceleration" @default.
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• W2098324443 doi "https://doi.org/10.1016/j.pepi.2012.03.002" @default.
• W2098324443 hasPublicationYear "2012" @default.
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