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Radiation in Air Source Located in From an Electric Line Current an Ionospheric Halfspace
Author(s) -
Wade H. D.,
Williams R. H.
Publication year - 1966
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1002/rds19661153
Subject(s) - physics , polarization (electrochemistry) , electric field , computational physics , ionosphere , perpendicular , linear polarization , magnetic field , radiation , optics , geophysics , geometry , mathematics , quantum mechanics , laser , chemistry
A uniform electric line current source is immersed a short distance into an ionospheric halfspace, the model of which is a homogeneous, linear, cold, lossy, single‐component magnetoplasma halfspace. Formal integral expressions for the electric fields radiated into the adjoining air halfspace are derived by a solution of Maxwell's equations in each region, using double Fourier transform techniques. The formal integral expressions for the radiation‐zone electric fields in air are evaluated asymptotically by the method of stationary phase. Radiation patterns are plotted for several combinations of polarization, frequency, depth of immersion, direction of magnetostatic field, and region of ionosphere. The field strength increases with frequency in the VLF spectrum, for a given strength of the line source. The field strengths are considerably larger for a magnetostatic field B 0 = 0.5 G than for B 0 = 0. There is a tendency for the vertical polarization to be enhanced in directions along B 0 and reduced in directions perpendicular to B 0 . The horizontal polarization is affected less by B 0 than the vertical polarization.