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