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.[1] 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.
References
Magnetogravity wave Wikipedia(Text) CC BY-SA