Magnetic diffusivity
The magnetic diffusivity is a parameter in plasma physics. It appears in the Magnetic Reynolds number. The magnetic diffusivity is defined as:[1]
.
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is the permeability of free space.
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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
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is the electron density.
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is the electron charge.
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is the electron mass.
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is the collision frequency.
-
References
- ↑ W. Baumjohann and R. A. Treumann, Basic Space Plasma Physics, Imperial College Press, 1997