Journal ArticleDOI
LIII. The propagation of very low frequency radio waves to great distances
Reads0
Chats0
TLDR
In this paper, it was shown that the measurements can be explained in terms of the four least attenuated wave-guide modes, and that the height of the boundary is 69·1±0·5 km.Abstract:
Summary In discussing the propagation of very low frequency radio waves to great distances, it is convenient to treat the space between the earth and the ionosphere as a wave-guide. This treatment is applied to some experimental measurements made by Dr. Weekes on signals of frequency 16 kc/s, over a range of distances from 340 km to 3640 km from the sender. It is shown that the measurements can be explained in terms of the four least attenuated wave-guide modes. If the earth's magnetic field is neglected, and the ionosphere is assumed to be a sharply bounded homogeneous, ionized medium, then it is shown that the height of the boundary is 69·1±0·5 km.read more
Citations
More filters
Journal ArticleDOI
ELF and VLF radio waves
TL;DR: A review of developments in ELF and VLF radio-wave propagation research over the last 50 years of the Journal of Atmospheric and Solar-Terrestrial Physics can be found in this paper.
Journal ArticleDOI
Propagation of Audio-Frequency Radio Waves to Great Distances
F. W. Chapman,R. C. V. Macario +1 more
Journal ArticleDOI
ELF waves in the presence of exponential ionospheric conductivity profiles
TL;DR: In this paper, the surface impedance of an isotropic nonhomogeneous ionosphere is calculated at an altitude h where the local refractive index n does not necessarily satisfy |n|\gg1.
Journal ArticleDOI
The Numerical Solution of the Differential Equations Governing the Reflexion of Long Radio Waves from the Ionosphere. II
TL;DR: In this paper, the authors present a series of curves which are the results of some calculations of the reflecting properties of various models of the ionosphere for radio waves of frequency 16 kc/s.
Journal ArticleDOI
Very‐Low‐frequency phase observations of solar flare ionization in the D region of the ionosphere
TL;DR: In this paper, sudden phase anomalies produced by solar flares have been observed simultaneously on several long VLF propagation paths and the observations showed that during a solar flare the magnitude of the mean change of reflection height Δh on each sunlit path can apparently be related to the mean of log sec χ along the path, where χ is the solar zenith angle.
References
More filters
Journal ArticleDOI
The Diffraction of Electric Waves by the Earth
Abstract: During the last 15 years, the problem of determining the effect at a distant point of the earth’s surface due to a Hertzian oscillator emitting waves of a definite frequency has been the subject of numerous theoretical investigations. When certain assumptions of a physical character have been made, the problem is of a definitely mathematical type; it is in fact reduced to the problem of finding an approximate formula for the sum of a certain complicated seines of an oscillatory nature; we shall summarise the principal methods which have been devised for dealing with this series.
Journal ArticleDOI
I. The propagation of a radio-atmospheric
TL;DR: In this paper, the authors have discussed the propagation of radio-atmospherics by assuming that the space between the earth's surface and the ionosphere behaves like a wave-guide.
Journal ArticleDOI
XII. The waveforms of atmospherics and the propagation of very low frequency radio waves
TL;DR: In this article, the responses of narrow-band receivers to individual radio atmospherics have been observed in order to describe the propagation of radio waves of frequency 2 kc/s. over the surface of the earth.
Journal ArticleDOI
Further investigations of very long waves reflected from the ionosphere
TL;DR: In this paper, the interference pattern produced at the ground by the superposition of the ground wave and the downcoming wave was investigated over a range of distances from 65 to 145 km from the sender in a fine running east from Rugby.
Journal ArticleDOI
CXII. The use of atmospherics to study the propagation of very long radio waves
TL;DR: In this paper, the authors analyzed the spectral distribution of energy at the source and showed that the most significant effect is seen to be a marked attenuation of waves of frequency below 10 kc/s when travelling over distances of 1000 km.