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Ionospheric electromagnetic wave propagation

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  • Physics [2]
  • Geophysics, astronomy and astrophysics [2]
  • Aeronomy, space physics, and cosmic rays [2]
  • Ionosphere [2]
  • Ionospheric electromagnetic wave propagation [2]
  • Electrical and electronic engineering [2]
  • Electromagnetic fields [2]
  • Electromagnetic waves, antennas and propagation [2]
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Quasicubic-segmented ionospheric model
Author(s): R.J. Norman, P.L. Dyson, J.A. Bennett
Source: IEE Proceedings - Microwaves, Antennas and Propagation, Volume 143, Issue 4, 1996 , p. 323 - 327
Type: Article
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A method is presented of fitting quasicubic segments (QCS) automatically to measured electron-density profiles of the ionosphere. Any number of layers and valleys which occur in the ionosphere may be represented by this model, where the parameters are found by fitting to actual data points. The approach is similar to that adopted for the quasiparabolic-segment (QPS) model which has been developed in recent years and applied to a variety of ionospheric-propagation studies. The new model has been developed as an improvement to the QPS model, particularly when power calculations are required. The QCS model, like the QPS model, has analytic solutions for a number of ray quantities in the ionosphere and so can be used to study the same range of propagation phenomena as can be studied using the QPS model.

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A HF ionospheric propagation model using analytic ray tracing
Author(s): R.J. Norman, I.G. Platt, P.S. Cannon
Source: IEE Colloquium on HF Antennas and Propagation, 1995, p. 8 - 8
Type: ConferencePaper
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A method to approximate horizontal gradients when using analytic ray tracing is presented. This method involves automatically tilting the modelled ionospheric profile by displacing the Earth's centre. This method is applied to a grid point ionospheric model which consists of a known ionospheric model coupled with real-time ionospheric measurements at a number of locations. Thus, the grid point ionospheric model is a real-time ionospheric model and together with the tilting method, is useful in a number of applications. Analytic ray tracing results incorporating the tilting method and the grid point ionospheric model are presented. In order to demonstrate the effectiveness of this analytic approach the results are compared with those obtained using the numerical ray tracing package HIRT (homing-in ray tracing) Norman et al., [1994] over the same region. (6 pages)

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