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 …

Abstract 80 years ago, Joseph Larmor planted the seed that grew into today's imposing body
of knowledge about how the Earth's magnetic field is created. His simple idea, that the …

A review of the present status of the theory of magnetic reconnection is given. In strongly
collisional plasmas reconnection proceeds via resistive current sheets, ie quasi-stationary …

These lecture notes are based on a tutorial given in 2017 at a plasma physics winter school
in Les Houches. Their aim is to provide a self-contained graduate-student level introduction …

The operation of the solar global dynamo appears to involve many dynamical elements,
including the generation of fields by the intense turbulence of the deep convection zone, the …

A new kind of overset grid, named Yin‐Yang grid, for spherical geometry is proposed. The
Yin‐Yang grid is composed of two identical component grids that are combined in a …

Numerical calculations of fluid dynamos powered by thermal convection in a rotating,
electrically conducting spherical shell are analyzed. We find two regimes of nonreversing …

An accurate description of turbulent core convection is necessary in order to build robust
models of planetary core processes. Towards this end, we focus here on the physics of …

We analyse∼ 50 3-D numerical calculations of hydrodynamic dynamos driven by
convection in a spherical shell. We examine rigid and stress-free boundaries, with Prandtl …

In 1995, two groups [Kageyama et al., 1995; Glatzmaier and Roberts, 1995a, 1995b]
reported results of numerical integrations of fully three‐dimensional, fully nonlinear …