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- W2091287488 abstract "At HF or higher frequencies, in computing the polarization conditions along a radio ray traveling in the ionosphere, it is often sufficient to express the results in terms of the Faraday rotation of the plane of polarization, obtained as an integral (along the path) of the phase difference between the ordinary and extraordinary components. The computation simplifies when the quasilongitudinal (QL) approximation of magneto-ionic theory can be applied. The QL approximation is invalid at any point where the ray becomes transverse to the geomagnetic field, and in some regions around that point. In 1963 George A. Dulk showed that neglect of this effect may lead to major errors. In considering an oblique path with sky-wave reflection, it is easy to be misled into thinking that a transverse condition is unlikely except on east-west paths, particularly in equatorial regions. On the contrary, transverse conditions are likely to occur under a wide range of conditions at all latitudes and for all propagation directions. This presentation describes conditions of ray geometry and magnetic latitude, which result in transversality at some point along the path. The method for defining the conditions is shown to be applicable even when the ray is permitted to follow a twisted path in three dimensions, and the geomagnetic field is defined under very general assumptions. The basic results are also directly applicable to problems concerned with the reflection of HF signals by field-aligned ionization." @default.
- W2091287488 created "2016-06-24" @default.
- W2091287488 creator A5000584887 @default.
- W2091287488 date "1971-10-01" @default.
- W2091287488 modified "2023-09-24" @default.
- W2091287488 title "Conditions for Orthogonality Between the Geomagnetic Field and an HF Sky-Wave Ray" @default.
- W2091287488 cites W1989667650 @default.
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- W2091287488 doi "https://doi.org/10.1029/rs006i010p00879" @default.
- W2091287488 hasPublicationYear "1971" @default.
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