The lithospheric contribution to the Earth's magnetic field is concealed in magnetic field data
that have now been measured over several decades from ground to satellite altitudes. The …

Torsional Alfvén waves involve the interaction of zonal fluid flow and the ambient magnetic
field in the core. Consequently, they perturb the background magnetic field and induce a …

The aa index, designed to describe the geomagnetic activity at global scale, has been
shown to have increased in the twentieth century by about 65%. The increase in the case of …

Short-term constituents of the secular variation, at inter-decadal (20–30 years) and sub-
centennial (60–90 years) time scales, present in observatory data and main field models …

The temporal evolution of the geomagnetic field is shown, on data from 24 observatories
with 100–150 years long time series of annual means, to be composed of several …

In the present paper we discuss a few issues regarding the secular variation (SV) and
secular acceleration (SA) of the geomagnetic field that have consequences on mapping …

In this work, the secular variation of noon/midnight geomagnetic observed field has been
investigated at Karachi observatory using the data of total geomagnetic field (F) for the …

A complex and detailed model of the lateral and temporal evolution of the horizontal
component of the main geomagnetic field and its secular variation in Romania between …

A magnetic induction model has been applied to recordings obtained in 2010 during the
field campaigns for geomagnetic measurements at the 26 repeat stations of the Romanian …

This thesis deals with the application of the Spherical Cap Harmonic Analysis (SCHA)
modelling technique to obtain geomagnetic field models for Indonesia, which have better …