Can magnetic waves in aurorae transform into acoustic waves?

Acoustic waves from the Sun's photosphere transform into magnetic waves in the chromosphere (Johnson et al., 2001; Bogdan et al., 2000, 2002, 2003). While there is no clear evidence of audible sound in aurorae (e.g. northern {\&} southern lights), infrasound (acoustic waves below 20 Hertz) emanating from aurorae has been detected. How are these auroral acoustic waves created? Alfv\'{e}n waves in the Earth's magnetosphere have been observed to arise from solar magnetic storms.~ Can these magnetic waves similarly transform into acoustic waves? On the Sun, this acoustic-to-magnetic wave transformation occurs where the atmospheric pressure and the magnetic pressure are comparable (beta $\sim $ 1), in the chromosphere.~ This wave transformation is crucial for transporting photospheric energy to the hot corona. We investigate evidence and mechanisms for magnetic-to-acoustic wave transformation in the Earth's ionosphere, where beta $\sim $ 1.