Magnetic Fields are not ignorable in the dynamics of disks

E. Battaner, E. Florido, A. Guijarro

Magnetic fields are considered to be dominant when ${\epsilon }_B\ge {\epsilon }_K$, being ${\epsilon }_B=B^2/8\pi$ the magnetic energy density and ${\epsilon }_K=1/2\rho {\theta }^2$ the rotation energy density, for a co…