Observations and modeling of multi-frequency VHF and GHz scintillations in the equatorial region

Computer Science – Performance

Scientific paper

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Equatorial Regions, Ionospheric Propagation, Marisat Satellites, Satellite Transmission, Scintillation, Performance Prediction, Statistical Analysis, Very High Frequencies, Wave Propagation

Scientific paper

Amplitude scintillation spectra and statistics obtained simultaneously at VHF (257.55 MHz), L-band (1541.5 MHz), and C band (3945.5 MHz) from the MARISAT communications satellite (15 deg W) are presented. The measurements were made at Ascension Island over a high evaluation propagation path within a few degrees of the magnetic meridian plane. The multifrequency data and the unique propagation geometry make it possible to study the structures of the equatorial ionospheric irregularities closely. Numerical simulation is used to model a specific event. Comparisons between the modeling results and the observations indicate that the data are consistent with the recently measured (in situ) two-component power law irregularity spectrum with a shallow large-scale regime and a steeper small-scale regime, and a spectral break at about 1-km scale size.

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