The secular variation of the core field is generally characterized by smooth variations,
sometimes interrupted by abrupt changes, named geomagnetic jerks. The origin of these …

Gravity gradient measurements from ESA's satellite mission Gravity field and steady-state
Ocean Circulation Explorer (GOCE) contain significant high-and mid-frequency signal …

The series of magnetic measurements at some European observatories give some hint of a
new geomagnetic jerk around 1999. The geomagnetic impulses would present the …

The Earth's revolution is modified by changes in inclination of its rotation axis. Its trajectory is
not closed and the equinoxes drift. Changes in polar motion and revolution are coupled …

In 1799, Laplace derived the system of differential equations (now called Liouville-Euler)
that fully describes the motions of the rotation axis of any celestial body. Laplace showed …

Historical to up‐to‐date data of the minute variations in the solid Earth's rotation are
subjected to a comprehensive time‐frequency wavelet analysis. The length‐of‐day for the …

Wavelet analysis is a sensitive method for automatically detecting and distinguishing abrupt
discontinuities (ie, faults, unconformities), cyclicity, and gradual changes in sedimentation …

A geomagnetic jerk is a phenomenon involving the geomagnetic field secular variation
when it abruptly changes its slope. It is generally accepted that it occurs on timescales from …

By subtracting computed atmospheric angular momentum from a time-series for length-of-
day variations, we obtain a high-resolution time-series that is useful for studying the effects …

Two long time series were analysed: the C01 series of the International Earth Rotation
Service and the pole series obtained by re-analysis of the classical astronomical …