Dipole magnetic-field line
= Dipole magnetic-field line
An axisymmetric dipole field line satisfies $r=C\sin^2\theta$, where $C$ is its equatorial crossing radius. This follows by integrating $dr/(r\,d\theta)=B_r/B_\theta=2\cot\theta$.
= Dipole magnetic-field line
An axisymmetric dipole field line satisfies $r=C\sin^2\theta$, where $C$ is its equatorial crossing radius. This follows by integrating $dr/(r\,d\theta)=B_r/B_\theta=2\cot\theta$.