| propagation velocity of Alfvén waves
B is the magnetic flux density
ρ is the mass density
μ0 is the magnetic constant
Note 1 to entry: The phase velocity of Alfvén waves is
is the Alfvén wave velocity
c0 is the speed of light in vacuum.
The Alfvén wave velocity does not depend on the wavelength, so it shows no dispersion.
Note 2 to entry: The coherent SI unit of the Alfvén wave velocity is metre per second, m/s.