Results 151 to 160 of about 369 (184)
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What drives the equatorial electrojet?
Journal of Atmospheric and Terrestrial Physics, 1995Abstract 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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Some features of the equatorial electrojet
Planetary and Space Science, 1969The equivalent circuit method of Stening (1968) is used to calculate current distributions in the vicinity of the equatorial electrojet. Both height and latitude profiles are obtained which show reasonable agreement with observations. The tube of magnetic force model employed in the calculations is useful in understanding some of the variations in the ...
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The storm-time equatorial electrojet
Journal of Atmospheric and Terrestrial Physics, 1977A 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 +4 more
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Critical problems of equatorial electrojet
Advances in Space Research, 1992This 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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A study of the equatorial electrojet—II A model electrojet that fits H-observations
Journal of Atmospheric and Terrestrial Physics, 1959Abstract 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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Longitudinal variation in the equatorial electrojet
Journal of Atmospheric and Terrestrial Physics, 1962The enhancement of the diurnal range of the horizontal component (H) of the earth's magnetic field over the magnetic equator, believed to be due to the equatorial electrojet, is shown to be most pronounced in the American Zone and least in the Indian Zone, using the data contained in Egedal's report to IATME, observations by Pramanik et al.
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The equatorial electrojet and the gradient instability
Journal of Geophysical Research, 1971The 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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On the return current of the equatorial electrojet
Advances in Space Research, 1992Abstract In practically all cases, investigators have found it compelling to include westward currents on the flanks of the dip equator in order to fit well the observed dip equatorial magnetic variation profiles. There are three sources of the return currents: the geometry of field lines in the dynamo region, the polarization at the boundaries of ...
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Neutral Wind Profiles During Periods of Eastward and Westward Equatorial Electrojet
Geophysical Research Letters, 2021Jürgen Matzka +2 more
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