Results 141 to 150 of about 950 (162)

Some possible coupling echoes on ionograms

Journal of Atmospheric and Terrestrial Physics, 1973
Abstract The possibility of a mode coupling process in thin E S -layers producing extra traces on ionograms is considered. One such trace on an ionogram recorded at Armidale, Australia is examined in detail and a possible coupling mechanism proposed to explain the observed reflections.
C.I Chessell, I.A Bourne, R.A Smith
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Synthesis of three‐dimensional ionograms

Radio Science, 1973
A previously reported method of exact calculation of ray‐path parameters for a spherically symmetric ionosphere with its center of curvature displaced from the center of the earth is extended to permit the synthesis of three‐dimensional ionograms, i.e., group path, azimuthal angle of arrival, and elevation angle of arrival versus frequency, for a ...
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Synthesis of oblique ionograms from vertical ionograms using quasi-parabolic segment models of the ionosphere

Journal of Atmospheric and Terrestrial Physics, 1992
Abstract This paper describes a method of synthesizing oblique ionograms from vertical ionograms based on representing the ionosphere by multiple quasi-parabolic segments (QPS). The advantage of this approach is that it allows analytical solutions to be obtained for several ray parameters when the Earth's magnetic field is neglected and the ...
J. Chen, J.A. Bennett, P.L. Dyson
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Analysis of Stress Ionograms.

1977
Abstract : Anomalous radar returns seen on ionograms following ionospheric barium releases are analyzed to determine their origin and their interpretation. Two types of echoes are identified; one type originates from the barium cloud and the other type from layers formed by the descent of barium ions into the E-region.
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First bistatic oblique‐incidence ionograms between digital ionosondes

Radio Science, 1983
Identical digital ionosondes (dynasondes) at Brighton Colorado and at White Sands Missile Range, New Mexico, 864 km distant, were synchronized for bistatic sounding in multifrequency and fixed frequency recording patterns. Three propagation modes are observed, identified, and reconciled with standard propagation theory; these include one‐hop ...
Wright, J.W., Kressman, R.I.
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Computer-aided ionogram reduction: Software structure

Advances in Space Research, 1988
Abstract Special software has been developed in view of an automated ionogram reduction and statistical handling of relevant data. Requirement for such software are formulated and possible ways to satisfy these are shown. Distinguishing different levels, a detailed description of system levels and terminal maintenance is given. Much attention is paid
G.M. Emeljanov, I.U. Zukovsky, N.I. Smirnov   +2 more
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Single‐Polynomial Analysis of Ionograms

Radio Science, 1969
A new formulation of the single‐polynomial analysis is presented, in which the electron density profile is assumed to begin with a flat base at a height equal to the lowest measured virtual height. This formulation gives a more accurately defined profile with only a small number of points and agrees with the assumptions normally made. Near the critical
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The analysis of night-time ionograms

Journal of Atmospheric and Terrestrial Physics, 1975
Abstract The analysis of ionospheric h′(ƒ) records can give appreciable errors at night, when large amounts of ionisation may be present with plasma frequencies less than the minimum recorded frequency ƒ min . The errors depend on both the total amount of low-density ionisation, and on the ionisation gradient near ƒ min .
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Frequency shift in ionogram gyrofrequency resonance

Proceedings of the IEEE, 1970
Additional evidence is presented from Alouette II ionogram data for the observed frequency difference between the plasma resonance detected near the electron gyrofrequency f H and the ionospheric value of f H =2.8 MHz ċ gauss-1. The observed values of the electron gyrofrequency resonance are usually about one percent higher than the ionospheric values ...
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ionogram, n.

2023
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