Few areas of geophysics are today progressing as rapidly as basic geomagnetism, which
seeks to understand the origin of the Earth's magnetism. Data about the present …

Evidence of fast variations in the Earth's core field are seen both in magnetic observatory
and satellite records. We present here how they have been identified at the Earth's surface …

The magnetic field inside the Earth's fluid and electrically conducting outer core cannot be
directly probed. The root-mean-squared (rms) intensity for the resolved part of the radial …

We present CHAOS-4, a new version in the CHAOS model series, which aims to describe
the Earth's magnetic field with high spatial and temporal resolution. Terms up to spherical …

Geomagnetic jerks are abrupt changes in the second time derivative—the secular
acceleration—of Earth's magnetic field that punctuate ground observatory records. As their …

The state of knowledge and understanding of planetary magnetic fields is reviewed. All of
the planets, with the possible exception of Venus, have had active dynamos at some time in …

Variations in Earth's rotation (defined in terms of length of day) arise from external tidal
torques, or from an exchange of angular momentum between the solid Earth and its fluid …

The magnetic field of the Earth is by far the best documented magnetic field of all known
planets. Considerable progress has been made in our understanding of its characteristics …

We present DTU's candidate field models for IGRF-12 and the parent field model from which
they were derived, CHAOS-5. Ten months of magnetic field observations from ESA's Swarm …

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 …