A Snapshot of Propagation Characteristics Observed by TIGER

P. L. DYSON1, R. J. NORMAN1, M. L. PARKINSON1, J. C. DEVLIN2 and J. A. BENNETT3

(1) Department of Physics, La Trobe University, Australia
(2) Department of Electronic Engineering, La Trobe University, Australia
(3) Department of Electrical and Computer Systems Engineering, Monash University,

TIGER was operated as a swept-frequency backscatter sounder for a two-day period in February. The subsequent ionograms provide an overview of HF propagation conditions in the form of a frequency-range map of ionospheric scatter and standard HF propagation modes supported by the prevailing ionospheric conditions. Mode identification is aided by angle-of-arrival measurements as well as velocity and spectral width measurements. Angle-of-arrival measurements provide a simple means of determining the equivalent mirror heights of reflection and scattering and of determining the true echo range. This paper will compare observations with model calculations.

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