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Jim Fuller edited Magnetic_fields_can_provide_the__.tex
almost 9 years ago
Commit id: e1b22c3adffe3894c7e6bd04c266d09255e43d5f
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\label{eqn:maggrav}
\omega_{\rm MG} = \bigg[ \frac{2}{\pi} \frac{B_r^2 N^2}{\rho r^2} \bigg]^{1/4} \, .
\end{equation}
{\bf Figure
\ref{fig:cartoon} illustrates the basic properties of waves propagating in a red giant with a strongly magnetized core, and Figure \ref{fig:Prop} shows a wave propagation diagram in which a strong internal magnetic field prevents magneto-gravity wave propagation in the core.}
In red giants, $B_c$ is typically smallest at the peak in $N$ corresponding to the sharp density gradient within the hydrogen burning (H-burning) shell (see Figure \ref{fig:Prop}). Therefore, gravity waves are most susceptible to magnetic alteration in the H-burning shell. The observation of a star with suppressed dipole modes thus provides a {\it lower limit} to the radial field strength (equation \ref{eqn:Bc}) evaluated in the H-burning shell. We refer to this field strength as $B_{c,{\rm min}}$. Magnetic suppression via horizontal fields can also occur, but in general requires much larger field strengths.
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