Simulation of equatorial electrojet magnetic effects with the thermosphere‐ionosphere‐electrodynamics general circulation model
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In this paper, the authors examined the magnetic variations simulated by the NCAR thermosphere-ionosphere-electrodynamics general circulation model (TIE-GCM) in the vicinity of the magnetic equator, and found that the modeled contributions of the thermospheric migrating diurnal and semidiurnal tides to the magnetic perturbations have large longitudinal variations.Abstract:
[1] In this work, the magnetic variations simulated by the NCAR thermosphere-ionosphere-electrodynamics general circulation model (TIE-GCM) in the vicinity of the magnetic equator are examined to evaluate the ability of this model to reproduce the major features of the equatorial electrojet (EEJ) as observed on the ground as well as on board low-altitude orbiting satellites The TIE-GCM simulates electric currents of various origins and reproduces their associated magnetic perturbations We analyze the diurnal and latitudinal variations of the EEJ magnetic effects calculated on the ground in West Africa under approximately the same solar activity condition as in 1993 for the March equinox and June and December solstices The latitudinal and local time structures of these simulated results correspond well to those that are observed We also compare longitudinal variations of the midday EEJ magnetic perturbations observed by the CHAMP satellite with the model predictions Although the simulations and observations both show multiple maxima and minima in longitude, the locations of these extrema often disagree In the model most of the longitudinal variation of the magnetic variations is associated with nondipolar structure of the geomagnetic field We find that the modeled contributions of the thermospheric migrating diurnal and semidiurnal tides to the magnetic perturbations have large longitudinal variations, and we suggest that an increase in the amplitude of these tides in the TIE-GCM may cause them to play a major role in explaining the morphology of the EEJ longitudinal variationread more
Citations
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The influence of nonmigrating tides on the longitudinal variation of the equatorial electrojet
TL;DR: In this article, the effect of nonmigrating tides on the strength of the diurnal eastward propagation of the equatorial electrojet (EEJ) has been investigated.
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Sources of low-latitude ionospheric E × B drifts and their variability
TL;DR: In this article, the authors examined the contribution of gravity and plasma pressure gradient driven current, the geomagnetic main field, and longitudinal variation in the conductivities to the vertical drift.
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The importance of geomagnetic field changes versus rising CO2 levels for long-term change in the upper atmosphere
TL;DR: In this paper, a quantitative comparison of the effects of the increase in CO2 concentration and changes in the magnetic field from 1908 to 2008, based on simulations with the Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM), is presented.
Journal ArticleDOI
Model simulation of the equatorial electrojet in the Peruvian and Philippine sectors
Tzu-Wei Fang,Tzu-Wei Fang,Arthur D. Richmond,Jann-Yenq Liu,Astrid Maute,Chien Hung Lin,Chia-Hung Chen,B. Harper +7 more
TL;DR: In this paper, the NCAR Thermosphere-Ionosphere-Electrodynamics General Circulation Model (TIE-GCM) is used to simulate the equatorial electrojet current and its magnetic perturbation on the ground.
References
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Journal ArticleDOI
A thermosphere/ionosphere general circulation model with coupled electrodynamics
TL;DR: In this paper, a new simulation model of upper atmospheric dynamics is presented that includes self-consistent electrodynamic interactions between the thermosphere and ionosphere and uses the resultant electric fields and currents in calculating the neutral and plasma dynamics.
Journal ArticleDOI
Migrating and nonmigrating diurnal tides in the middle and upper atmosphere excited by tropospheric latent heat release
Maura E. Hagan,Jeffrey M. Forbes +1 more
TL;DR: In this paper, the global scale wave model (GSWM) is used to investigate mesospheric and lower thermospheric migrating and non-migrating diurnal tidal components that propagate upward from the troposphere, where they are excited by latent heat release associated with deep tropical convection.
Journal ArticleDOI
A coupled thermosphere/ionosphere general circulation model
TL;DR: In this paper, the NCAR TGCM was extended to include a self-consistent aeronomic scheme of the thermosphere and ionosphere and the model now calculates total temperature, instead of perturbation temperature about some specified global mean, global distributions of N(µD), N(4S) and NO, and a global ionosphere with distributions of O+,NO+, O2+, N2+ N2+, n+, electron density, and ion temperature as well as the usual fields of winds, temperature and major composition.
Journal ArticleDOI
Ionospheric Electrodynamics Using Magnetic Apex Coordinates.
TL;DR: In this paper, the equations of ionospheric electrodynamics are developed for a geomagnetic field of general configuration, with specific application to coordinate systems based on Magnetic Apex Coordinates.
Journal ArticleDOI
Control of equatorial ionospheric morphology by atmospheric tides
Thomas J. Immel,Eiichi Sagawa,Scott L. England,S. B. Henderson,Maura E. Hagan,Stephen B. Mende,Harald U. Frey,Charles Swenson,Larry J. Paxton +8 more
TL;DR: Immel et al. as discussed by the authors showed that ionospheric densities vary with the strength of nonmigrating, diurnal atmospheric tides that are, in turn, driven mainly by weather in the tropics.
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