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\label{fig:cartoon}   {\bf Wave propagation in red giants with magnetized cores.} Acoustic waves excited in the envelope couple to gravity waves in the radiative core. In the presence of a magnetic field in the core, the gravity waves are scattered at regions of high field strength. Since the field cannot be spherically symmetric, the waves are scattered to high angular degree $\ell$ and become trapped within the core. core {\bf where they eventually dissipate (dashed wave with arrow)}.  We refer to this as the magnetic greenhouse effect.