Abstract
This paper deals with the geometry of radio rays originating at an arbitrary point in a force-free dipole magnetic field. The echo surface, defined by the points where the rays intersect the field at right angles, is calculated. The distance from the source point to the echo surface is computed and plotted for various configurations. Assuming an opaque sphere in the field, the solid angle subtended at the source by the echo surface as well as the height of the echo surface above the sphere is computed and plotted. This is done also for the derivative of the angle between the ray and the magnetic field, evaluated at the echo surface. Graphs are drawn only for rays lying in the magnetic meridian plane.
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