Results 131 to 140 of about 301 (185)

Irregularities in the upper ionosphere

Planetary and Space Science, 1964
The electron density distribution in ionospheric F-region shows irregularities of dimensions ranging from less than 1 km to more than 1000 km. These have been studied as spread-F, radio star scintillation, auroral structure and other phenomena. A review of the experimental data indicates that at least in the case of spread-F there are two different ...
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Nonperiodic irregularities in the ionosphere

Journal of Geophysical Research, 1971
Continuous records of the electron content of the ionosphere at latitudes of 34°S and 42°S show both periodic and isolated (nonperiodic) fluctuations in approximately equal numbers. Both types have peaks of occurrence near noon and midnight, although the isolated irregularities peak 2 hours before the periodic type.
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Ionospheric irregularity physics modelling

20th Aerospace Sciences Meeting, 1982
Theoretical and numerical simulation techniques have been employed to study ionospheric F region plasma cloud striation phenomena, equatorial spread F phenomena, and high latitude diffuse auroral F region irregularity phenomena. Each of these phenomena can cause scintillation effects. The results and ideas from these studies are state-of-the-art, agree
S. OSSAKOW, M. KESKINEN, S. ZALESAK
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Regularities and irregularities in the ionosphere

Vistas in Astronomy, 1956
Abstract A general survey of ionospheric phenomena is given, in which the regular variations f the E and F 1 layers, as illustrated by their intimate dependence on the Sun's zenith distance, are contrasted with the anomalous behaviour of the F 2 layer.
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Dispersive motions of ionospheric irregularities

Journal of Atmospheric and Terrestrial Physics, 1970
Abstract Cross correlation functions for satellite scintillations at spaced receivers, show a systematic skewness, indicative of dispersive motions of ionospheric irregularities. Other features of the correlation functions, such as secondary pumps frequently present at large time lags and a very obvious change in the shape of the curve over a long ...
Micheal D. Papagiannis, Terence J. Elkins   +1 more
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The height of large ionospheric irregularities

Journal of Atmospheric and Terrestrial Physics, 1966
Signal amplitude of Transit IVA satellite recorded at two stations, using time difference between observing similar fluctuations in fading period to determine height of ionospheric ...
G.F. Stuart, J.E. Titheridge
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Scintillations and the Latitude Distribution of Ionospheric Irregularities

Nature, 1961
KENT1 has reported a series of observations on the 40 Mc./s. transmissions from Sputnik 1 made at Cambridge during October 1957. He found that the transmissions always underwent rapid fading (scintillation) when the satellite was north of Cambridge but only occasionally when south of Cambridge.
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Blobs and irregularities in the auroral ionosphere

Journal of Atmospheric and Terrestrial Physics, 1996
Abstract The EISCAT BLOB experiment has been designed to study structuring of the plasma in the auroral ionosphere on scales of tens of kilometres transverse to the magnetic field. Results are presented from the initial observations that show three different types of field-aligned irregularities occurring within a time interval of about two hours ...
S.E. Pryse, L. Kersley, I.K. Walker
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Lower ionospheric irregularities

1967
This thesis is a study of the structure of that part of the ionosphere lying between 60 and 120 km. In the usual terminology the ionized parts of the atmosphere in this altitude range are called the ionospheric D and E regions, the boundary between them occurring at a height of 90 km.
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Evidence of elongated irregularities in the ionosphere

Journal of Geophysical Research, 1959
Radio observations of backscatter from ionospheric irregularities under both auroral and nonauroral conditions indicate the presence of small-scale irregularities, elongated along the earth's magnetic field. These elongated irregularities have been found at heights from 80 to 300 km.
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