Scattering of HF Radio Waves by a Spherical Electron Cloud
AIR FORCE CAMBRIDGE RESEARCH LABS HANSCOM AFB MA
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Numerical and analytic solutions in the ray-optics region have been obtained for the scattering of HF radio waves by a spherical electron cloud with a Gaussian distribution of electron density in the radial direction. The results show that a highly overdense or hard cloud has a wide range of backscatter angles for which the cross section is almost constant with a value close to that of an equivalent conducting sphere critical radius size. A slightly overdense or soft sphere has a much narrower range of almost constant cross section whose value is proportional to the fourth power of the critical radius and considerably below that of an equivalent conducting sphere.
- Atmospheric Physics
- Radiofrequency Wave Propagation