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Jordan Sligh edited section_Creation_of_a_Magnetosphere__.tex
over 8 years ago
Commit id: 2b2b51ee3c514a8886c879dc2332fa63ba99b69a
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Because the convecting currents which generate the magnetosphere are complex and occur within the spherical outer core, we will simplify our calculations by approximating Mars' outer core as a single gigantic rotating cylinder with radius ${R_{outer core} - R_{inner core}}/2$ and height $2R_{outer core}$. With this approximation, we find Mars' magnetic dipole moment to be
$B_0 =
\rho_c\omega\mu_0({R_{outer {\rho_c\omega\mu_0}/{16\pi}({R_{outer core}-R_{inner
core}}/2]^42R_{outer core}/{16\pi}$ core}}/2)^42R_{outer core}$
where $\rho_c$ is the charge density of the outer core and $\omega =
2\pi/2t_"con"$ {2\pi}/{2t_{con}}$ where
$t_con$ $t_{con}$ is the convective timescale.
$t_con$ is mathematically related directly to the adiabatic gradient, and using this we can find the necessary inner core temperature
$T_inner$ $T_{inner}$ as a function of the the outer core temperature
$T_outer$. $T_{outer}$.
Consolidating the necessary equations we find that
$$t_con $t_{con} =
[T_outer/g((dT/dr)_ad-\delta{T}/\delta{r})^-1]$$ [T_{outer}/g((dT/dr)_{ad}-\delta{T}/\delta{r})^{-1}]$
where the adiabatic gradient
$(dt/dr)_ad $(dT/dr)_{ad} =
(\gamma {\gamma -
1)/\gamma T_outer/P_c 1}/\gamma T_{outer}/P_c dP/dr$
and $dP/dr = -4/3\piG\rho^2R_inner$, $g=4/3\piG\rhoR_inner$, and the planet's central pressure $P_c = 2/3\piG\rho^2R_p^4$.