Results 181 to 190 of about 2,552 (218)

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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The electrojet phenomenon

Contemporary Physics, 1968
Abstract The term ‘electrojet’ is frequently used to describe the intense bands of electric curent which flow at certain times in the earth's ionosphere at an altitude of about 100 km. Two main forms of electrojet current are distinguished; an equatorial electrojet which flows during the daylight hours in a narrow band of latitudes centred on the ...
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A study of the equatorial electrojet—II A model electrojet that fits H-observations

Journal of Atmospheric and Terrestrial Physics, 1959
Abstract Methods are developed for separating the observed variation of the horizontal magnetic force ( H ) into its two component parts—the effect of the equatorial electrojet and the “normal variation” without the electrojet. It is shown that in such a separation, it is necessary to allow for the possible phase difference between the two component ...
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The Auroral Electrojets

1979
The auroral electrojets are the ionospheric component of three-dimensional current systems through which the outer magnetosphere is coupled to the ionosphere. These current systems permit energy imparted to the convective motion of magnetospheric plasma to be dissipated in the ionosphere through the process of Joule heating.
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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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A model of the auroral electrojets

Journal of Geophysical Research, 1964
Certain observations indicate that the auroral electrojets are confined to the auroral arcs. A model of an arc is presented in which the height variation of the auroral ionization is taken into account and vertical currents are allowed to flow. The current flow in the arc is investigated, and the electric field or wind velocity field required to drive ...
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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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Temporal characteristics of the Equatorial Electrojet and Counter Electrojet over Ethiopian sector

Advances in Space Research, 2015
Abstract In this paper, we reported on a case study of the temporal characteristics of the Equatorial Electrojet (EEJ) and Counter Electrojet (CEJ) over Ethiopian sector during an interval on August 27, 2008 inferred from ground-based magnetometer observations.
Endalkachew Mengistu, Tsegaye Kassa
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Polarization of the auroral electrojet

Journal of Geophysical Research, 1968
The transient growth of an induced electric field is examined on the assumption that a primary electric field has been impressed along a band of aurorally enhanced conductivity in the ionosphere. The time contant for the growth is shown to be unimportant compared with the time scale of the auroral substorm, and the possibility that a certain class of ...
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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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