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<p>must deal with the complexities of a spatially varying refractive index, where changes in ionospheric <a href="page.php?w=electron">electron</a> densities influence the refractive index and hence, ray trajectories. Two sets of signals are broadcast at two different elevation angles. When the main signal penetrates into the ionosphere, the magnetic field splits the signal into two component waves which are separately ray traced through the ionosphere. The <a href="page.php?w=Birefringence">ordinary wave</a> (red) component follows a path completely</p><p>
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