Magnetic diffusivity

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The magnetic diffusivity is a parameter in plasma physics. It appears in the Magnetic Reynolds number. The magnetic diffusivity is defined as:^[1]

$\eta ={\frac {1}{\mu _{0}\sigma _{0}}}$ .

$\mu _{0}$ is the permeability of free space.
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
- $n_{e}$ is the electron density.
- $e$ is the electron charge.
- $m_{e}$ is the electron mass.
- $\nu _{c}$ is the collision frequency.

References

↑ W. Baumjohann and R. A. Treumann, Basic Space Plasma Physics, Imperial College Press, 1997

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