Results 181 to 190 of about 1,267 (222)

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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Modeling the equatorial electrojet

Journal of Geophysical Research: Space Physics, 1985
The equivalent circuit method has been modified to give greater accuracy and greater detail near the equator in order to model the equatorial electrojet. Electron collision frequencies used in the conductivity model are consistent with laboratory measurements.
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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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Comparison of equatorial electrojet models

Journal of Atmospheric and Terrestrial Physics, 1977
Abstract Comparison of different models of the equatorial electrojet with several observed parameters shows that models using high electron collision frequency are in better agreement. The electron collision frequency in Richmond's (1972) numerical model has been adjusted empirically to fit experimental results.
J. Gagnepain, M. Crochet, A.D. Richmond
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The storm-time equatorial electrojet

Journal of Atmospheric and Terrestrial Physics, 1977
A Petrel rocket carrying a double cell rubidium magnetometer was launched from the Thumba Equatorial Rocket Launching Station during the early main phase of a magnetic storm. No ionospheric currents associated with the storm were observed, and the large field depression at the flight time must therefore be attributed to currents at higher altitudes ...
K. Burrows, T.S.G. Sastry, S. Sampath, J.D. Stolarik, M.J. Usher   +4 more
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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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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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Classes of the Equatorial Electrojet

2005
The equatorial electrojet signal recorded on the Overhauser Magnetometer (OVM) on board CHAMP can be divided into four classes: the classical electrojet (EEJ), the counter electrojet (CEJ), no electrojet (NEJ) and a new term, formation of the electrojet (FEJ).
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Rocket measurement of the equatorial electrojet

Journal of Geophysical Research, 1970
Four Nike-Apache rockets, equipped with cesium vapor magnetometers, were launched in the equatorial electrojet region in March 1965. The rocket launched at the magnetic equator during the period of maximum electrojet current flow detected a 220-γ discontinuity in the magnetic field between 96 and 130 km. A peak current density of 13.5 amp/km² at 106 km
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The equatorial electrojet and the gradient instability

Journal of Geophysical Research, 1971
The physics of the equatorial electrojet current is briefly reviewed, and a suitable model is set up to investigate whether it is unstable to the gradient instability. The model allows for the variation of collision frequency with height and an arbitrary electron density distribution. Approximate solutions that indicate instability are obtained.
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