A magnetogravity wave is a type of plasma wave. A magnetogravity wave is an acoustic gravity wave which is associated with fluctuations in the background magnetic field. In this context, gravity wave refers to a classical fluid wave, and is completely unrelated to the relativistic gravitational wave.
Examples Magnetogravity waves are found in the corona of the Sun.
See also Wave Plasma Magnetosonic wave Helioseismology
References