Weak scattering theory applied to equatorial ionospheric scintillation for a wide range of parametric values

Physics – Geophysics

Scientific paper

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Atmospheric Scattering, Equatorial Atmosphere, Ionospheric Propagation, Satellite Transmission, Scintillation, Spread F, Atmospheric Ionization, Geophysics, Microwave Transmission, Morning, Phase Deviation

Scientific paper

The paper applies the model of ionospheric fluctuations to describe spread-F to ionospheric scintillation in the band from 100 MHz to 10 GHz in equatorial regions. Calculations are based on long isotropic field-aligned irregularities possessing an inverse power-law spectrum extending from an outer scale linked to the properties of the neutral atmosphere down to an inner scale of the order of the ionic gyroradius. Heights of equivalent single phase-changing screens are deduced for phase and amplitude fluctuations; they are different from each other and from the height of maximum ionization density. It is concluded that the weak scattering theory can explain weak scintillation, but that amplitude scintillation requires the inclusion of refractive scattering in addition to diffractive scattering.

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