A Panoramic View of Ionospheric Reflection and Transmission Under Ambient and Disturbed Conditions

by Henry G. Booker, Cullen M. Crain, E. C. Field

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The technical basis and results of a computer program using magneto-ionic equations to assess the effects of ambient and disturbed daytime and nighttime ionospheres on radio waves from microwave (10 GHz) to hydromagnetic (.001 Hz) frequencies. (Below about 100 Hz, the ray approach used gives only lower bounds for the transmission loss.) The disturbed conditions correspond to either a mild nuclear environment or a severe polar cap absorption event. Given the signal frequency, angle of incidence, and atmospheric ionization profile, the program calculates the real and imaginary components of the complex refractive index at all heights, the differential absorption at all heights, the reflection of nonpenetrating signal components, and the transmission of penetrating components, for either quasi-longitudinal or quasi-transverse transmissions. Results clearly show the existence of height-dependent pass bands, stop bands, and conduction bands in the ionosphere. Reflection levels and two-way reflection losses are also shown.

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