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 …

We present a two-step method for the removal of external field signals and the identification
of geomagnetic jerks in magnetic observatory monthly mean data, providing quantitative …

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 …

Geomagnetic jerks are rapid time variations of the magnetic field at the Earth's surface that
are thought to be of primarily internal origin. Jerks are relevant for studies of the Earth …

Geomagnetic secular variation (SV) models for the epochs before the space era are based
on magnetic observatory data, which represent relatively rough and noisy time series due to …

The period and quality factor of the Chandler wobble (CW) are useful for constraining the
Earth's internal structure properties, such as the mantle elasticity. It has been shown that the …

Intermittency represents a certain form of heterogeneous behavior that has interest in
diverse fields of application, particularly regarding the characterization of system dynamics …

We reconsider the analysis of the polar motion with a method totally different from the
wavelet analysis used in previous papers. The total polar motion is represented as the sum …

The secular variation in the global geomagnetic field was analyzed in terms of the annual
differences in monthly means by using the hourly mean data from 18 foreign (outside China) …

New mathematical constructions are developed for the regression smoothing of discrete
time series defined on an irregular grid. The new method is used to study secular trends for …