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The earth's ionosphere
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The article was published on 1989-01-01 and is currently open access. It has received 862 citations till now. The article focuses on the topics: Ionosphere.read more
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Modeling investigation of the evening prereversal enhancement of the zonal electric field in the equatorial ionosphere
TL;DR: In this article, a flux-tube-integrated model of ionospheric electrodynamics is used to examine three proposed causes of the prereversal enhancement of the zonal electric field.
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IAP, the thermal plasma analyzer on DEMETER
Jean-Jacques Berthelier,Michel Godefroy,F. Leblanc,Elena Seran,D. Peschard,P. Gilbert,J. Artru +6 more
TL;DR: The instrument d'Analyse du Plasma (IAP) on board DEMETER provides a nearly continuous survey of the main parameters of the thermal ion population with two main objectives as discussed by the authors.
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Longitudinal variation of F region electron density and thermospheric zonal wind caused by atmospheric tides
TL;DR: In this article, simultaneous observations of the electron density and the zonal wind obtained by the CHAMP satellite at 400 km were used to study systematic longitudinal variations, and the time period selected is August-September 2004 allowing observations at pre-noon and post-sunset hours.
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Energetics of the ionospheric feedback interaction
Robert L. Lysak,Yan Song +1 more
TL;DR: In this paper, the ionospheric feedback instability has been invoked as a possible mechanism for the formation of narrow auroral arcs, and the free energy for this instability comes from the reduction of Joule heating due to the preexisting convection caused by the self-consistent changes in ionization and conductivity due to Alfvenic perturbations on the ionosphere.
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Propagation of tsunami‐driven gravity waves into the thermosphere and ionosphere
Abstract: [1] Recent observations have revealed large F-region electron density perturbations (∼100%) and total electron content (TEC) perturbations (∼30%) that appear to be correlated with tsunamis. The characteristic speed and horizontal wavelength of the disturbances are ∼200 m/s and ∼400 km. We describe numerical simulations using our spectral full-wave model (SFWM) of the upward propagation of a spectrum of gravity waves forced by a tsunami, and the interaction of these waves with the F-region ionosphere. The SFWM describes the propagation of linear, steady-state acoustic-gravity waves in a nonisothermal atmosphere with the inclusion of eddy and molecular diffusion of heat and momentum, ion drag, Coriolis force, and height-dependent mean winds. The tsunami is modeled as a deformation of our model lower boundary traveling at the shallow water wave speed of 200 m/s with a maximum vertical displacement of 50 cm and described by a modified Airy function in the horizontal direction. The derived vertical velocity spectrum at the surface describes the forcing at the lower boundary of the SFWM. A steady-state 1-D ionospheric perturbation model is used to calculate the electron density and TEC perturbations. The molecular diffusion strongly damps the waves in the topside (>300-km altitude) ionosphere. In spite of this, the F-region response is large, with vertical displacements of ∼2 to 5 km and electron density perturbations of ∼100%. Mean winds have a profound effect on the ability of the waves to propagate into the F-region ionosphere.