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Ray trace calculation of ionospheric propagation at lower frequencies
Author(s) -
Reilly Michael H.
Publication year - 2006
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 - 10.1029/2005rs003338
Subject(s) - ionosphere , whistler , computational physics , physics , ionospheric reflection , earth–ionosphere waveguide , radio propagation , ionospheric absorption , ionospheric heater , refraction , high frequency , electron density , geophysics , electron , optics , quantum mechanics , astronomy
The Raytrace/Ionospheric Conductivity and Electron Density–Bent‐Gallagher model has been revised to make it applicable to ionospheric propagation at low radio frequencies (0.5–5.0 MHz), where the ionosphere and magnetic anisotropy drastically alter propagation paths and provide a severe test of propagation model algorithms. The necessary revisions are discussed, and the model is applied to the problem of ionospheric penetration from a source below the ionosphere to a receiver above the ionosphere. It is necessary to include the electron collision frequency in the Appleton‐Hartree index of refraction in order to permit ionospheric penetration for radio frequencies below the maximum plasma frequency (e.g., whistler modes). The associated reformulation of the ray trace equations for a complex index of refraction is straightforward. Difficulties with numerical methods are cited for the lowest frequencies, and future improvements are indicated.