The Sun and other stars are magnetic: magnetism pervades their interiors and affects their
evolution in a variety of ways. In the Sun, both the fields themselves and their influence on …

The current understanding of astrophysical magnetic fields is reviewed, focusing on their
generation and maintenance by turbulence. In the astrophysical context this generation is …

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 …

We study numerically an extensive set of dynamo models in rotating spherical shells,
varying all relevant control parameters by at least two orders of magnitude. Convection is …

We consider observational and theoretical estimates of the accretion disc viscosity
parameter α. We find that in thin, fully ionized discs, the best observational evidence …

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 …

We present three-dimensional nonlinear magnetohydrodynamic simulations of the interiors
of fully convective M dwarfs. Our models consider 0.3 solar-mass stars using the Anelastic …

The magnetic field of the Sun is the underlying cause of the many diverse phenomena
combined under the heading of solar activity. Here we describe the magnetic field as it …

The generation of a magnetic field in an electrically conducting fluid generally involves the
complicated nonlinear interaction of flow turbulence, rotation and field. This dynamo process …

We review advances in the theoretical and computational studies of disk winds, jets and
outflows including: the connection between accretion and jets, the launch of jets from …