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Journal of Atmospheric and Terrestrial Physics, 1959
Abstract Spread- F conditions have been examined for six low-latitude stations—Dakar, Khartoum, Djibouti, Ibadan, Nairobi and Leopoldville. It is shown that, contrary to the general view, occurrence of disturbed magnetic conditions inhibits the occurrence of spread- F layers during the southern solstice at all these stations.
R.W. Weight, N.J. Skinner
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Abstract Spread- F conditions have been examined for six low-latitude stations—Dakar, Khartoum, Djibouti, Ibadan, Nairobi and Leopoldville. It is shown that, contrary to the general view, occurrence of disturbed magnetic conditions inhibits the occurrence of spread- F layers during the southern solstice at all these stations.
R.W. Weight, N.J. Skinner
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An Overview and Synthesis of Plasma Irregularities in Equatorial Spread F
Journal of Atmospheric and Solar-Terrestrial Physics, 2000D. Hysell
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The belt of equatorial spread-F
Journal of Atmospheric and Terrestrial Physics, 1960Abstract The morphology of the belt of equatorial spread-F at sunspot maximum is investigated, using I.G.Y. data, for magnetically quiet and magnetically disturbed conditions respectively. The belt is found to extend from about 30°S to 30°N in magnetic latitude and to have a region of very high incidence, exceeding 90 per cent for the early part of ...
Lyon, AJ, Skinner, NJ, Wright, RWH
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Duration of equatorial spread F
Nature, 1975IT is well established1–3 that the spread-F phenomenon, which is observed as diffuse echoes on the ionograms is a common feature during night time between the dip latitudes 20°N and 20°S. Based on the study of ionograms and published monthly f0F2 bulletins, morphological features of spread F have been reported for several equatorial stations1,4–10 ...
V. V. SOMAYAJULU +2 more
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A study of equatorial spread-F
Journal of Atmospheric and Terrestrial Physics, 1963Data from seven stations ranging in magnetic dip from 0° to 44°N have been analysed to study night time and seasonal variations of spread-F through nearly half a solar cycle. It is observed that the inhibition of spread-F due to geomagnetic activity is maximum in the equinoxes.
S. Rangaswamy, K.B. Kapasi
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Artificial control of equatorial spread-F
Journal of Atmospheric and Terrestrial Physics, 1978Abstract We have studied the influence of a large amplitude electric field oscillating near the upper hybrid frequency on the dispersion characteristics of low frequency Rayleigh-Taylor modes and collisional drift modes. Since these modes have been proposed as principal constituents of spread- F , we investigate the conditions for the parametric ...
S Bujarbarua, A Sen
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Equatorial Spread-F and Magnetic Activity
Nature, 1958IT is well known that the ionospheric spread-F condition is extremely common at night in equatorial regions. At Ibadan, Nigeria (latitude 7½°N.), this has been especially so during the past 2½ years of high sunspot activity. It is believed that the same irregularities which produce the wide spread of scattered echoes from the F-region are also ...
A. J. LYON, N. J. SKINNER, R. W. WRIGHT
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Journal of Geophysical Research - Space Physics, 2020
In this paper, we present a study on the local time dependence of equatorial spread F (ESF) irregularities and their relation to low‐latitude Es layers in response to geomagnetic storms using simultaneous observations of two ionosondes one located at ...
Ram Singh, S. Sripathi
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In this paper, we present a study on the local time dependence of equatorial spread F (ESF) irregularities and their relation to low‐latitude Es layers in response to geomagnetic storms using simultaneous observations of two ionosondes one located at ...
Ram Singh, S. Sripathi
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Equatorial spread-F and solar activity
Journal of Atmospheric and Terrestrial Physics, 1964Abstract The effect of solar activity on equatorial spread- F has been studied using the published tables of f 0 F 2 from six Afro-Asian stations. The strong negative correlation between equatorial spread- F and magnetic activity observed during sunspot maximum is no longer significant during low sunspot years.
S. Rangaswamy, K.B. Kapasi
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On the Genesis of Postmidnight Equatorial Spread F: Results for the American/Peruvian Sector
Geophysical Research Letters, 2018Previous studies of the Earth's low‐latitude ionosphere using in situ measurements made by sensors on the Communication/Navigation Outage Forecasting System (C/NOFS) satellite showed an unexpected predominance of equatorial spread F (ESF) events in the ...
Wei-Jia Zhan, F. Rodrigues, M. Milla
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