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Jim Fuller edited Magnetic_fields_can_provide_the__.tex
almost 9 years ago
Commit id: 6fcd46bd8e155ecb3ba40e67e29eb1d8bb28ac6f
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Magnetic fields can provide the mechanism for trapping oscillation mode energy in the core by altering gravity wave propagation. The nearly horizontal motions and short radial wavelengths of gravity waves in RGB cores will bend radial magnetic field lines, creating strong magnetic tension forces. {\bf The
buoyant acceleration
created by required to restore a wave
with horizontal displacement
$\xi_r$ in the radial direction $\xi_{\rm h}$ is $\sim \!
\xi_r N^2$, \xi_{\rm h} \omega^2$, whereas the magnetic tension acceleration due to a
horizontal wave displacement $\xi_{\rm h}$ in a radial magnetic field of strength $B_r$ is $\xi_{\rm h} B_r^2 k_r^2/(4 \pi \rho)$, where $k_r$ is the radial wavenumber and $\rho$ is the density. Gravity waves are strongly altered by the magnetic fields when these two forces are equal, which for dipole waves occurs at a critical magnetic field strength (see supplementary online material)}
\begin{equation}
\label{eqn:Bc}
B_c= \sqrt{\frac{\pi \rho}{2}} \, \frac{\omega^2 r}{N} \, .
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