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\label{Fig:cartoon} Generally In normal red giant stars  acoustic waves excited in the envelopeof red giant stars  can couple to gravity waves in the radiative core. However, in In  the presence of a strong magnetic field in the stellar core,the  p-modes couple to magneto-gravity and pure Alfven waves. waves instead.  Regardless of the details of this process, the energy leaking from the envelope through the evanescent region is trapped scattered  into a large number of modes with high harmonic degree $\ell$. High  $\ell$ modes can not escape the core due to their large evanescent region and are trapped  (magnetic greenhouse effect).