Elsasser number

The Elsasser number, Λ, is a dimensionless number in magnetohydrodynamics that represents the ratio of magnetic forces to the Coriolis force.^[1]

$\Lambda ={\frac {\sigma B^{2}}{\rho \Omega }}$

where σ is the conductivity of the fluid, B is the magnetic field, ρ is the density of the fluid, and Ω is the rate of rotation of the body.

Notes

Gubbins, David, and Emilio Herrero-Bervera, eds. Encyclopedia of geomagnetism and paleomagnetism. Springer Science & Business Media, 2007.

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