magnetic diffusivity

magnetic diffusivity

[mag′ned·ik ‚di‚fyü′siv·əd·ē]
(electromagnetism)
A measure of the tendency of a magnetic field to diffuse through a conducting medium at rest; it is equal to the partial derivative of the magnetic field strength with respect to time divided by the Laplacian of the magnetic field, or to the reciprocal of 4πμσ, where μ is the magnetic permeability and σ is the conductivity in electromagnetic units.
References in periodicals archive ?
Where [eta] represents all parameters involved, in this case, the viscosity, the magnetic diffusivity, and external magnetic field.