The calculation of ionospheric absorption with modern computers |
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Authors: | Carlo Scotto Alessandro Settimi |
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Institution: | Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Rome, Italy |
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Abstract: | New outcomes are proposed for ionospheric absorption starting from the Appleton–Hartree formula, in its complete form. The range of applicability is discussed for the approximate formulae, which are usually employed in the calculation of non-deviative absorption coefficient. These results were achieved by performing a more refined approximation that is valid under quasi-longitudinal (QL) propagation conditions. The more refined QL approximation and the usually employed non-deviative absorption are compared with that derived from a complete formulation. Their expressions, nothing complicated, can usefully be implemented in a software program running on modern computers. Moreover, the importance of considering Booker’s rule is highlighted. A radio link of ground range D = 1000 km was also simulated using ray tracing for a sample daytime ionosphere. Finally, some estimations of the integrated absorption for the radio link considered are provided for different frequencies. |
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Keywords: | Appleton&ndash Hartree formula More refined quasi-longitudinal approximation Usually employed non-deviative absorption Booker&rsquo s rule |
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