Results 181 to 190 of about 3,685 (224)

Equatorial electrojet phenomenon

AIP Conference Proceedings, 1992
Evidence has been discussed showing: that the ionospheric current system is basically in two layers; that the upper current layer peaking over the dip equator at 136±8 km altitude is likely the worldwide part of Sq; that the lower current layer peaking at 106 km altitude is likely the equatorial electrojet (EEJ); and that the EEJ returns close by the ...
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Instabilities in the equatorial electrojet

Journal of Geophysical Research, 1973
From recent radar data, we draw two new conclusions. First, the so-called magnetic ‘threshold effect’ has little physical significance at radar frequencies of 50 MHz or less and results simply from the way in which past data have been presented. At these frequencies, type II irregularities give strong echoes for electron drift velocities well below the
D. T. Farley, B. B. Balsley
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Equatorial Electrojet in Ghana

Nature, 1962
PRELIMINARY investigations on magnetic variation in Ghana were reported at the Helsinki Congress of the International Union of Geodesy and Geophysics in 1960. It was suggested that the variability from day to day in the diurnal range of the vertical field component at a station 0.5° south of the magnetic equator indicated a movement of the equatorial ...
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Equatorial drift and the electrojet

Journal of Geophysical Research, 1963
Apparent horizontal east-west drift velocities in the F layer were measured near the magnetic equator at Tamale in northern Ghana by the spaced- receiver, pulse-fading method. These velocities are compared with changes in the horizontal magnetic field strength in the daytime.
D. G. Osborne, N. J. Skinner
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Equatorial electrojet and radio scintillations

Journal of Atmospheric and Terrestrial Physics, 1983
Abstract It is shown that the day-time scintillations of VHF radio waves at the equatorial station, Huancayo, are very small, of the order of 1–2 dB peak, during the equatorial electrojet condition. If the event of complete or partial counter-electrojet occurring either on quiet or during disturbed conditions is followed by the occurrence of ...
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Equatorial electrojet and regular daily variation S—I. A determination of the equatorial electrojet parameters

Journal of Atmospheric and Terrestrial Physics, 1976
Abstract Records for 171 quiet (or almost quiet) days are available in a chain of six temporary stations and in three permanent observatories, spreading over 3000 km in latitude in Central Africa. The regular daily variation S R is defined by the deviation from the night level in each component.
O Fambitakoye, P.N Mayaud
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Critical problems of equatorial electrojet

Advances in Space Research, 1992
This paper describes the general features of the equatorial electrojet current over the magnetic equator based on ground geomagnetic observatory data, rocket borne magnetometer data, ground based HF and VHF sounding of the atmosphere. Also are described its association with magnetosphere currents, interplanetary magnetic field charges and with ...
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The Equatorial Ionospheric Anomaly and the Equatorial Electrojet

Radio Science, 1969
It is shown that for the American zone the F‐region equatorial anomaly and the equatorial electrojet are highly correlated, whereas the anomaly and the Sq current system correlate poorly. A suggested explanation for the correlation is that the eastward electric field which drives the electrojet is also present in the F‐region and there causes upward ...
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Formation of Equatorial Electrojet Current Layers

Nature, 1967
MEASUREMENTS of equatorial electrojet current by rockets have produced evidence for two current layers. The first electrojet current layer is prominent and appears at a height about 100 km and the second layer is less prominent and appears at heights of 120–150 km as shown in Fig. 1.
R. N. SINGH, K. D. MISRA
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What drives the equatorial electrojet?

Journal of Atmospheric and Terrestrial Physics, 1995
Abstract There is a controversy over whether the equatorial electrojet is a separate system with its own return currents at low latitudes or it is an integral part of the Sq current system driven by emfs mostly beyond the Sq focus. The arguments of Onwumechili (1989) in support of the first hypothesis are examined, but the second idea is preferred ...
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