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IEVref: | 121-14-07 | ID: | |

Language: | en | Status: Standard | |

Term: | magnetosonic wave | ||

Synonym1: | magnetoacoustic wave | ||

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Definition: | longitudinal magnetohydrodynamic wave
Note 1 to entry: The movement of the particles of the fluid is parallel to the direction of propagation of the magnetosonic wave; its wave vector The phase velocity of magnetosonic waves is $c}_{\phi}={c}_{0}^{}\sqrt{\frac{\left({v}_{s}^{2}+{v}_{A}^{2}\right)}{\left({c}_{0}^{2}+{v}_{A}^{2}\right)}$ where ${v}_{s}$ is the sound wave velocity (in a gas, ${v}_{s}^{}=\sqrt{\kappa p/\rho}$) ${v}_{A}$ is the Alfvén wave velocity ${c}_{0}$ is the speed of light in vacuum Note 2 to entry: For low magnetic fields, the phase velocity of the magnetosonic wave approaches sound wave velocity. | ||

Publication date: | 2021-03 | ||

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Note 1 to entry: The movement of the particles of the fluid is parallel to the direction of propagation of the magnetosonic wave; its wave vector ** k** is orthogonal to the magnetic flux density.

The phase velocity of magnetosonic waves is

$c}_{\phi}={c}_{0}^{}\sqrt{\frac{\left({v}_{s}^{2}+{v}_{A}^{2}\right)}{\left({c}_{0}^{2}+{v}_{A}^{2}\right)}$

where

${v}_{s}$ is the sound wave velocity (in a gas, ${v}_{s}^{}=\sqrt{\kappa p/\rho}$)

${v}_{A}$ is the Alfvén wave velocity

${c}_{0}$ is the speed of light in vacuum

Note 2 to entry: For low magnetic fields, the phase velocity of the magnetosonic wave approaches sound wave velocity.