Magnetic diffusivity - Alchetron, The Free Social Encyclopedia

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:

η = 1 μ 0 σ 0 ,

where μ 0 is the permeability of free space and σ 0 is the electrical conductivity of the material in question. In case of a plasma, this is the conductivity due to Coulomb or neutral collisions: σ 0 = n e e 2 m e ν c , where

n e is the electron density.

e is the electron charge.

m e is the electron mass.

ν c is the collision frequency.

References

Magnetic diffusivity Wikipedia

(Text) CC BY-SA