A magnetosonic wave is a compressive MHD mode polarized in the plane of the wavevector and background magnetic field.
The fast magnetosonic mode uses gas and magnetic pressure as reinforcing restoring forces and is the faster root of the magnetosonic dispersion relation.
The slow magnetosonic mode is the lower-frequency compressive root and is guided more strongly along the magnetic field.
The tube speed combines sound and Alfvén speeds according toIt is smaller than both constituent speeds.
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Magnetosonic waves, also known as magnetosonic waves or MHD (magnetohydrodynamic) waves, are a type of wave that occurs in magnetized plasmas, which are ionized gases that are influenced by magnetic fields. These waves are a combination of sound waves and magnetic waves, propagating through a medium where both gas pressure and magnetic pressure play significant roles.