Results 181 to 190 of about 1,756 (218)

Loop structuring of ionogram traces

Journal of Atmospheric and Terrestrial Physics, 1973
Abstract The phenomenon of small scale loop structuring of F-region ionogram traces is investigated; this loop structuring is shown to be caused by high-frequency ray propagation through irregularities in which dN/dz is less than ambient but greater than zero.
J.D. Mathews, B.S. Tanenbaum
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Classification of spread-F ionograms

Journal of Atmospheric and Terrestrial Physics, 1962
Abstract Scaling of original ionograms obtained in the polar regions has lead to a classification scheme for spread-F ionograms. Defined are three types of frequency spreading (spreadish-F, furcated-F and spurred-F) and one type of range spreading. Each type is subdivided into species.
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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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The interpretation of topside sounder ionograms

Proceedings of the IEEE, 1969
Most of the phenomena observed on Alouette I and Alouette II ionograms are identified and interpreted. Simple as well as complex ionograms are treated, but emphasis is placed on ionograms exhibiting very low electron density, spread-F and field-aligned propagation.
E.L. Hagg, E.J. Hewens, G.L. Nelms
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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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The stability of ionogram analysis techniques

Journal of Atmospheric and Terrestrial Physics, 1982
Abstract Ionograms commonly contain discontinuities or cusps in the virtual-height trace. These produce spurious oscillations in the calculated real heights, when second or higher order analysis techniques are used. The magnitude of this effect is studied using basic discontinuities and model ionograms.
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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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A note on the analysis of oblique ionograms

Journal of Atmospheric and Terrestrial Physics, 1973
Abstract A previously reported method of analysis of oblique ionograms is reformulated to enable an exact ray-calculation analysis of the oblique ionograms using only the assumptions of spherically symmetric ionosphere concentric with the Earth and neglect of the Earth's magnetic field.
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ionogram, n.

2023
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[Ionogram deviations].

Schweizerische medizinische Wochenschrift, 2000
W F, RUEDI, H W, HOTZ
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