Results 181 to 190 of about 6,013 (205)

Equatorial Electrojet and Counter Electrojet caused by the 15 January 2022 Tonga Volcanic Eruption

2023
We present space and ground-based multi-instrument observations demonstrating the impact of the 2022 Tonga volcanic eruption on dayside equatorial electrodynamics. A strong counter electrojet (CEJ) was observed by Swarm and ground-based magnetometers on 15 January after the Tonga eruption and during the recovery phase of a moderate geomagnetic storm ...
Guan Le, Guiping Liu, Endawoke Yizengaw, Christoph Englert   +3 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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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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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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Distortions in the height structure of the equatorial electrojet during counter electrojet events

Journal of Atmospheric and Terrestrial Physics, 1994
This paper presents simultaneous observations made near the magnetic equator during counter electrojet events using a coherent VHF backscattcr radar, magnetometer and digital ionosonde to understand the physical processes that generate the counter electrojet conditions.
V.V. Somayajulu, K.S. Viswanathan, K.S.V. Subbarao, L. Cherian   +3 more
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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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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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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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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 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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