Long-distance one-hop ionospheric radio-wave propagation

Muldrew, D. B.; Maliphant, R. G.

doi:10.1029/jz067i005p01805

Cited by 14 publications

(2 citation statements)

References 9 publications

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“…The most important candidate for this is the high angle 1F2 mode, which the prediction scheme does not consider over such long paths, but which has been observed to propagate over a similar path by Warren and Hagg and by Kift. 20 Muldrew and Maliphant 21 showed by ray tracing that such propagation was possible and observed one-hop propagation to be present on average 35% of the time two-hop propagation was present on an Ottawa-Hague path. In the summer this ratio rose to 80-90%.…”

Section: Discussion Of the Amplitude Resultsmentioning

confidence: 99%

Oblique h.f. radiowave propagation in the main trough region of the ionosphere

Lockwood

Mitchell

1980

Radio Electron. Eng. UK

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The propagation of 7-335 MHz, c.w. signals over a 5212 km sub-auroral, west-east path is studied. Measurements and semi-empirical predictions are made of the amplitude distributions and Doppler shifts of the received signals. The observed amplitude distribution is fitted with one produced by a numerical fading model, yielding the power losses suffered by the signals during propagation via the predominating modes. The signals are found to suffer exceptionally low losses at certain local times under geomagnetically quiet conditions. The mid-latitude trough in the F2 peak ionization density is predicted by a statistical model to be at the latitudes of this path at these times and at low K p values. A sharp cutoff in low-power losses at a mean K p of 2 75 strongly implicates the trough in the propagation of these signals. The Doppler shifts observed at these times cannot be explained by a simple ray-tracing model. It is shown however, that a simple extension of this model to allow for the trough can reproduce the form of the observed diurnal variation.

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Section: Discussion Of the Amplitude Resultsmentioning

confidence: 99%

Oblique h.f. radiowave propagation in the main trough region of the ionosphere

Lockwood

Mitchell

1980

Radio Electron. Eng. UK

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“…It was found that one-hop propagation may occur over 7,500-km paths in temperate regions and 10,000-km paths in equatorial regions. Measurements over the 5,600-km circuit between Ottawa, Canada, and The Hague, Netherlands, showed that one-hop propagation occurred regularly during the summer daytime [Muldrew and Maliphant, 1962]. It was proposed that divergence of the Pedersen ray may be reduced if diffusion is invoked which results in an increase of the layer width in a parabolic approximation, making this mode of propagation more likely [Sazhin and Tinin, 1975].…”

Section: Computational Studiesmentioning

confidence: 99%

High‐frequency ionospheric ducting—A review

Toman¹

1979

Radio Science

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The observational evidence for long-range propagation of high-frequency radio signals began to accumulate in 1926 when transatlantic communication links were established. In 1927, signals were detected that had propagated over large distances or circled the earth with little attenuation.Long-range and round-the-world (RTW) signals showed preferred periods of occurrence. Relatively high angles of incidence (20 ø relative to the horizontal) of such signals at the receiver paired with low attenuation ruled out conventional multihop propagation. An ionospheric refractive index boundary was postulated along which the signal propagates in a glancing incidence low-loss mode. The transmission path of observed long-delayed signals, originating from artificial earth satellites, was found to be located in the twilight zone. Experiments that used ground-based transmissions confirmed the role of ionospheric absorption and tilts for the occurrence of long-range and RTW signals. Detailed explanations for ionospheric ducting were provided by using several theoretical concepts and analyses. The Ixr (refractive index times geocentric distance) diagram was used for the study of ray propagation in a spherically stratified multilayered model ionosphere depicting characteristics of the ground-detached glancing incidence mode. The potential well analysis was applied to an inhomogeneous slowly varying ionosphere. Numerical ray-tracing computations were made by using model ionospheres with horizontal gradients. Ionospheric models were used to predict global properties of ionospheric wave channels. The role of scattering from natural and artificially induced ionospheric irregularities in long-range ionospheric ducting was investigated. 0048-6604 / 79 / 0506-0447501.00 447 448 K. TOMAN

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The Propagation of High Frequency Waves on the Winnipeg-Resolute Bay Oblique Sounder Circuit

Petrie¹,

Warren²

1968

Ionospheric Radio Communications

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Long-distance one-hop ionospheric radio-wave propagation

Cited by 14 publications

References 9 publications

Oblique h.f. radiowave propagation in the main trough region of the ionosphere

Oblique h.f. radiowave propagation in the main trough region of the ionosphere

High‐frequency ionospheric ducting—A review

The Propagation of High Frequency Waves on the Winnipeg-Resolute Bay Oblique Sounder Circuit

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