Results 81 to 90 of about 1,756 (218)
, 1974 203-206A method is presented for ray tracing from electron density information provided by a vertical ionogram. Making use of the same electron density profile shape for true height conversion of the ionogram and for the ray path parameter computation ...
Rao, N. Narayana
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Automatic interpretation of oblique sounding ionograms based on hybrid algorithms
Solar-Terrestrial PhysicsThe paper presents a method of interpreting data on oblique ionosphere sounding (OS) with a continuous chirp signal. Hybrid algorithms for automatic interpretation of ionograms by selected points with significant amplitude obtained during secondary data ...
Ponomarchuk S. N., Grozov V. P.
doaj +1 more source
Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.Abstract Precise characterization of the electron density profile is crucial for optimizing high frequency communications. Reconstruction models often assume an instantaneous ionospheric response to solar forcing or using time delays, neglecting the time‐integrated cumulative “memory effect” of plasma dynamics.
Hongwei Gong +9 more
wiley +1 more source
Accuracy comparison of ionogram inversion methods
Advances in Space Research, 1994 Results obtained with a new inversion method /1/ have been compared with the inversions as given by the ARTIST approach /2/. Future generalizations are suggested.
openaire +2 more sources
Improving the Automatic Inversion of Digital ISIS-2 Ionogram Reflection Traces into Topside Vertical Electron-Density Profiles [PDF]
, 2011 The topside-sounders on the four satellites of the International Satellites for Ionospheric Studies (ISIS) program were designed as analog systems. The resulting ionograms were displayed on 35-mm film for analysis by visual inspection.
Benson, R. F. +4 more
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A penalized motion detection model for extracting ionospheric echoes from low signal-to-noise ratio Ionogram video images [PDF]
Measuring the altitude distribution of electron density in the upper atmosphere, known as the ionosphere, using HighFrequency radio wave reflections often causes the low signal-to-noise ratio of ionospheric echoes due to radio frequency interference.
Hiroshige, Yuu +10 more
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Studies in ionogram analysis and interpretation
, 1975 The single-polynomial method for ionogram analysis is adapted to give a least-squares procedure in which the number of scaled virtual heights is greater than the number of terms in the real-height polynomial.
Lobb, R. J. (Richard J.)
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The analysis of topside ionograms [PDF]
, 1967 Analysis of Alouette II topside ...
Jackson, J. E.
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, 2023 We have examined ionospheric response to eleven earthquake events measuring less than four on the Richter scale during the year 2020 that occurred in the vicinity of New Delhi (28.6°N, 77.2°E, 42.4°N dip).
M. V. Sunil Krishna (16802025) +9 more
core +1 more source
A study of earth radar returns from Alouette satellite [PDF]
, 1967 Ground radar reflection coefficient analysis on Alouette sounder ...
Doemland, H. H. +2 more
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