IEVref: 121-14-09 ID: Language: en Status: Standard Term: Alfvén wave velocity Synonym1: Alfvén velocity Synonym2: Synonym3: Symbol: ${v}_{A}$ Definition: propagation velocity of Alfvén waves ${v}_{A}=B/\sqrt{\rho \mu {}_{0}}$ where 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 ${c}_{\phi }=\frac{{c}_{0}^{}{v}_{A}^{}}{\sqrt{\left({c}_{0}^{2}+{v}_{A}^{2}\right)}}$ where ${v}_{A}$ 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. Publication date: 2021-03 Source: ISO 80000-11:2019, item 11–8.4, Remarks Replaces: Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: