Magnetic bits and pieces (blog) – Anthony Yeates

Resistive steady states

Some thoughts on non-ideal equilibria.

Force-free fields: non-uniqueness and non-existence’

corona

Illustrating the conceptual difficulties of force-free extrapolation.

Winding gauge for the Lundquist field

helicity

An example where there is an exact formula for the vector potential.

A model prediction

corona

Comparison of magnetic connectivity in magneto-frictional and PFSS models.

The Great Solar Active Region of October 2014

helicity

dynamo

corona

The largest active region since 1990.

Ideal evolution of the `force-free parameter’

Is the field-line averaged force-free parameter invariant under an ideal, line-tied evolution?

New book on Magnetohydrodynamics

Short announcement.

Boundary conditions for potential field extrapolation

corona

Illustrating the difference between a source surface potential field and a typical reference potential field.

Two interpretations of a vector potential

helicity

Showing that the poloidal-toroidal helicity is equivalent to the winding gauge helicity.

Parameter continuation

A description of pseudo-arclength continuation.

A gauge matching trick

helicity

Solving a practical problem that arises when working with magnetic helicity.

Untangling the s-web

corona

What can we infer about the topology of the coronal magnetic field?