Magnetic diffusivity

The magnetic diffusivity is a parameter in plasma physics which appears in the magnetic Reynolds number. It has SI units of m²/s and is defined as: , while in Gaussian units it can be defined as . In the above, is the permeability of free space, is the speed of light, and is the electrical conductivity of the material in question. In case of a plasma, this is the conductivity due to Coulomb or neutral collisions: , where * is the electron density. * is the electron charge. * is the electron mass. * is the collision frequency.

Magnetic diffusivity

The magnetic diffusivity is a parameter in plasma physics which appears in the magnetic Reynolds number. It has SI units of m²/s and is defined as: , while in Gaussian units it can be defined as . In the above, is the permeability of free space, is the speed of light, and is the electrical conductivity of the material in question. In case of a plasma, this is the conductivity due to Coulomb or neutral collisions: , where * is the electron density. * is the electron charge. * is the electron mass. * is the collision frequency.