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Jim Fuller edited section_Magneto_Gravity_Waves_In__.tex
about 9 years ago
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\label{eqn:vamin}
2 \mu v_A > \frac{\omega^2}{N k_\perp} \, .
\end{equation}
This occurs approximately where the Alfven speed is larger than the radial component of the non-magnetic gravity wave velocity, i.e., where $v_A \gtrsim v_{g,r}$. Magneto-gravity waves are evanescent in regions
in which where $\omega < \omega_{\rm MG}$,
where and $\omega_{\rm MG}$ is the magneto-gravity frequency defined as
\begin{equation}
\label{eqn:maggrav}
\omega_{MG} = \sqrt{2 v_A N k_\perp} \, .
\end{equation}
In a magnetized red giant core,
the value of both $N$ and $v_A$ will
typically increase from the exterior of the radiative zone
inward. Incoming gravity waves become increasingly Alfvenic magneto-gravity waves as they propagate inward toward the
helium core. If the magnetic field strength becomes hydrogen burning shell. In stars with large enough
field strengths to satisfy equation
\ref{eqn:magnetogravity2}, the \ref{eqn:vamin} somewhere in their core, incoming gravity waves
are very strongly altered by will become evanescent where $\omega=\omega_{\rm MG}$. At this point, the
magnetic field. They may waves must either reflect
(i.e., they become evanescent as in equation \ref{eqn:magnetodisp3}), or
they may transform be transmitted into
purely the strongly magnetized region as Alfven waves.
Both processes are likely In both cases, the waves will be prevented from returning to
occur for an arbitrary field geometry. the surface of the star to be observed as solar-like oscillations.
\subsection{Magnetic Greenhouse Effect}