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Jim Fuller edited subsection_Joule_Damping_A_gravity__.tex
about 9 years ago
Commit id: 665a02ff46a4f4cc0dec5550e8e69804016d83d6
deletions | additions
diff --git a/subsection_Joule_Damping_A_gravity__.tex b/subsection_Joule_Damping_A_gravity__.tex
index a33b38a..10242ad 100644
--- a/subsection_Joule_Damping_A_gravity__.tex
+++ b/subsection_Joule_Damping_A_gravity__.tex
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where $\eta$ is the magnetic diffusivity.
The joule damping rate of equation \ref{joule} can be compared with the damping rate from radiative diffusion, $\Gamma_r = k_r^2 \kappa$, where $\kappa$ is the thermal diffusivity. The ratio of joule damping to thermal damping is
\begin{equation \begin{equation}
\label{eqn:jouleratio}
\frac{\Gamma_B}{\Gamma_r} = \frac{\eta}{\kappa} \frac{B^2 k_r^2}{(4 \pi)^2 \rho \omega^2} \nonumber \\
= \frac{\eta}{\kappa} \frac{l(l+1) B^2 N^2}{(4 \pi)^2 \rho r^2 \omega^4} \, .