Extreme values in ionospheric radio propagation

P. A. Bradley


Proposals are made for Earth-space and space-space paths to apply the term ?propagation degradation probability?, analogous to ?basic circuit reliability? adopted within the Radiocommunication Sector of the International Telecommunication Union (ITU-R) to quantify the performance of HF terrestrial ionospheric radio circuits. The principal elements characterising propagation impairments are described and formulae and a table given by the ITU-R are reproduced relating many of these effects to the path total electron content. Expressions are provided enabling estimates of the probabilities of occurrence of user-specified extreme values to be estimated in terms of their median quantities and day-to-day variabilities. The need is stressed for additional data collection and analyses both to refine the median values and to derive the required reference variability factors.


ionosphere;ionospheric propagation

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DOI: https://doi.org/10.4401/ag-3493
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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X