Results 181 to 190 of about 336,044 (232)

Tsunami Ionospheric Disturbances

2019
Big earthquakes and tsunamis can excite acoustic resonance between the land or ocean surface and the lower atmosphere. The wave amplitude increases against the decrease of the atmosphere density, making the upper atmosphere a good medium to propagate the gravity waves.
Shuanggen Jin, R. Jin, X. Liu
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Sudden ionospheric disturbances

Terrestrial Magnetism and Atmospheric Electricity, 1937
This paper presents a summary of the data and conclusions up to this time of an investigation, started about the middle of 1935, of a comparatively new phenomenon. The phenomenon is the occurrence of a sudden intense increase in the ionization of a portion of the ionosphere, with resultant transient disturbances in such phenomena as radio‐wave ...
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Ionospheric disturbances detected by MEXART

Advances in Space Research, 2012
Abstract The radio telescope MEXART was developed to make observations of interplanetary scintillation (IPS) produced by large scale disturbances associated with solar events. In this work it is shown that on occasion there are disturbances in the ionosphere that are related with these events and which cannot only contaminate the IPS but actually be ...
A. Carrillo-Vargas, R. Pérez-Enríquez, Mario Rodríguez-Martínez, R. López-Montes, G.A. Casillas-Pérez, E.A. Araujo-Pradere   +5 more
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Ionospheric disturbance forecasting

Journal of the British Institution of Radio Engineers, 1953
The paper reviews the methods adopted to forecast the ionospheric disturbances that occasionally interrupt short-wave communication circuits. The normal characteristics of the ionosphere and their regular variations are briefly described. The causes and effects of the various types of ionospheric disturbances are examined and methods of predicting ...
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Determination of travelling ionospheric disturbances

Journal of Atmospheric and Terrestrial Physics, 1978
A total of 35 days of Faraday rotation data was obtained from the ATS-6 radio beacon experiment operating with the closely spaced network of Elbert, Table Mountain, and Fort Morgan. The 140-MHz Faraday bandpass data are uncorrelated in the transmission range from 8 to 45 minutes. There are distinct, well correlated, and time-displaced maxima and minima
W. Degenhardt, G.K. Hartmann, K. Davies
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Ionospheric disturbances in Canada

Journal of Geophysical Research, 1952
Detailed analysis has been made of variations of F region ionization and of abnormally high absorption taking place during ionospherically disturbed periods at northern latitudes. It was found that the disturbance effect appears first in one part of the auroral zone and moves around the earth with the sun for several days. The effect of the disturbance
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Ionospheric disturbances due to thunderstorms†

International Journal of Electronics, 1973
Abstract The paper gives an account of the disturbances in the ionosphere due to the acoustic gravity waves produced by thunderstorms. It explains the phenomena that the ionospheric disturbances in the F-region are numerous and much more pronounced than in the E-region. It describes the mode of travelling of ionospheric disturbances due to horizontally
JAGDISH RAI, P. K. BHATTACHARYA, M. L. SAPRU   +2 more
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Periodic disturbances in the ionosphere

Journal of Geophysical Research, 1968
Total electron content measurements, at latitudes of 34°S and 42°S, showed that 30–50% of all large-scale irregularities in the ionosphere are periodic in space and in time. The observed wavelengths were generally between 40 and 160 km. The periods ranged from about 60 minutes down to a sharply defined lower limit of 15 minutes.
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Travelling disturbances in the ionosphere

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1950
Abstract Methods have been developed for the examination of the horizontal and vertical movements of short-period disturbances in the ionosphere. It has been found that quasi-periodic travelling disturbances with periods of from 10 to 60 min. are of frequent occurrence in the F region by day. They appear as temporary variations in the
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Continental maps of four ionospheric disturbances

Journal of Geophysical Research, 1952
Measurements of ƒ°F2 at 13 North American ionospheric stations are used to study the geographical distribution of ƒ°F2 deviations from normal and the changes with time during four ionospheric disturbances. In two of these, storm centers can be identified which appear to move across the maps during the disturbance.
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