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Generalising the Elsasser variables, we introduce the Q-variables. These aremore flexible than the Elsasser variables, because they also allow to trackwaves with phase speeds different than the Alfven speed. We rewrite the MHDequations with these Q-variables. We consider also the linearised version ofthe resulting MHD equations in a uniform plasma, and recover the classicalAlfven waves, but also separate the fast and slow magnetosonic waves in upwardand downward propagating waves. Moreover, we show that the Q-variables may alsotrack the upward and downward propagating surface Alfven waves in a non-uniformplasma, displaying the power of our generalisation. In the end, we lay themathematical framework for driving solar wind models with a multitude of wavedrivers.

The magnetohydrodynamic equations in terms of waveframe variables