Journal ArticleDOI
The Equatorial Electrojet
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TLDR
In this article, the typical quiet day variations of the equatorial electrojet (EEJ) current intensity with time of the day, season, sunspot number, and geomagnetic latitude are presented in terms of the corresponding variations of ΔH which is the deviation of the horizontal component (H) from its steady nighttime level.Abstract:
The typical quiet day variations of the equatorial electrojet (EEJ) current intensity with time of the day, season, sunspot number, and geomagnetic latitude are presented in terms of the corresponding variations of ΔH which is the deviation of the horizontal component (H) of the geomagnetic field from its steady nighttime level. The observed height structure of the current density in the EEJ as measured in rocket flights is presented, along with the theoretically computed structure. Theoretical model results on the polarization electric fields and east-west currents as generated by the local interactions of height-varying winds in the EEJ show large height gradients and reversals for both currents and electric fields; experimental evidence for the reality of such height structures is also shown. The characteristics of the counter-electrojet events are presented and the possible causative mechanisms are discussed critically.read more
Citations
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Journal ArticleDOI
Estimating daytime vertical ExB drift velocities in the equatorial F-region using ground-based magnetometer observations
TL;DR: In this article, the vertical ExB drift velocity in the ionospheric F region and the daytime strength of the equatorial electrojet in the South American (west coast) longitude sector was investigated.
Journal ArticleDOI
Time dependent response of equatorial ionospheric electric fields to magnetospheric disturbances
Bela G. Fejer,Ludger Scherliess +1 more
TL;DR: In this article, the authors used extensive radar measurements of F region vertical plasma drifts and auroral electrojet indices to determine the storm time dependence of equatorial zonal electric fields.
Journal ArticleDOI
Low latitude electrodynamic plasma drifts - A review
TL;DR: The characteristics and driving mechanisms of low-latitude ExB plasma drifts and electric fields particularly at F-region heights are reviewed in this paper, where it is concluded that the general characteristics of the quiet-time plasma can be explained as resulting from E- and Fregion dynamo and interhemispheric coupling processes.
Journal ArticleDOI
The electrodynamics of the low-latitude ionosphere: Recent results and future challenges
TL;DR: In this article, the authors examined the present understanding of low-latitude F-region electrodynamics focusing on the large-scale distribution of the ionospheric electric fields and their response to magnetospheric disturbances.
Journal ArticleDOI
Sq and EEJ—A review on the daily variation of the geomagnetic field caused by ionospheric dynamo currents
Yosuke Yamazaki,Astrid Maute +1 more
TL;DR: In this article, the authors review advances in understanding of the geomagnetic daily variation and its source ionospheric currents during the past 75 years and provide possible directions for future work.
References
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Journal ArticleDOI
The ionospheric disturbance dynamo
M. Blanc,Arthur D. Richmond +1 more
TL;DR: In this article, a numerical simulation study of the thermospheric winds produced by auroral heating during magnetic storms, and of their global dynamo effects, establishes the main features of the ionospheric disturbance dynamo.
Journal ArticleDOI
An explanation for anomalous equatorial ionospheric electric fields associated with a northward turning of the interplanetary magnetic field
TL;DR: In this paper, the authors suggest that anomalous reversals of the zonal equatorial electric field component are associated with a sudden change in the convection electric field in the magnetosphere and present measurements to support this explanation.
Journal ArticleDOI
Coherence of geomagnetic DP 2 fluctuations with interplanetary magnetic variations
TL;DR: In this paper, the authors compared the worldwide geomagnetic data with IMP 1 magnetic records obtained in the interplanetary space, and found that the magnetic fluctuations of the magnetospheric convective system are coherent with variations in the north-south component of the inter-planetary magnetic field.
Journal ArticleDOI
Dependence of equatorial F region vertical drifts on season and solar cycle
TL;DR: In this article, the vertical drift measurements have been made at Jicamarca for more than half a solar cycle and the data from periods of high and low activity are appreciably different.
Journal ArticleDOI
The equatorial electrojet
TL;DR: An integrated treatment of observations and models of the undisturbed equatorial electrojet is presented in this article, where accomplishments during the past 15 years involving all aspects of the phenomenon are covered and, where possible, interrelated.