Results 141 to 150 of about 86,535 (196)
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Reviews of Geophysics, 1975
Ionospheric irregularities are small‐scale structures in the ionospheric plasma density generally oriented so that the plasma density variations occur rapidly across the geomagnetic field but slowly (or not at all) along the geomagnetic field. On the practical side, they play an important role in satellite communication systems [Utlaut, 1974].The scale
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Ionospheric irregularities are small‐scale structures in the ionospheric plasma density generally oriented so that the plasma density variations occur rapidly across the geomagnetic field but slowly (or not at all) along the geomagnetic field. On the practical side, they play an important role in satellite communication systems [Utlaut, 1974].The scale
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Reviews of Geophysics, 1979
Exciting developments in the understanding of ionospheric irregularities have occurred during the 1975–1978 time frame. Advances in experimental and in theoretical and computer simulation techniques have provided the tools for this progress. Major successes have been attained in the understanding of equatorial spread F phenomena.
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Exciting developments in the understanding of ionospheric irregularities have occurred during the 1975–1978 time frame. Advances in experimental and in theoretical and computer simulation techniques have provided the tools for this progress. Major successes have been attained in the understanding of equatorial spread F phenomena.
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Robust Detection of Ionospheric Irregularities
Navigation, 2001The approach outlined in this paper conservatively bounds the ionospheric errors even for the worst observed ionospheric conditions to date, using data sets taken from the operational receivers in the WAAS reference station network.
Todd Walter +13 more
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Irregularities in the upper ionosphere
Planetary and Space Science, 1964The 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, 1971Continuous 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, 1982Theoretical 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, 1956Abstract 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, 1970Abstract 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 +1 more
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The height of large ionospheric irregularities
Journal of Atmospheric and Terrestrial Physics, 1966Signal 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, 1961KENT1 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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