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Modeling diurnal variations of the IAR parameters

Modeling diurnal variations of the IAR parameters Abstract Characteristic feature of the upper ionosphere is the occurrence of the ionospheric Alfvén resonator (IAR) and MHD waveguide, which can trap the electromagnetic waves in the frequency range from fractions of Hz to few Hz. The proposed numerical model is based on the solution of MHD equations in a realistic ionosphere, whose parameters are reconstructed from the IRI model. We estimated, both analytically and numerically, a critical, wave scale dependent, value of the Hall conductance when a wave equation for an uncoupled Alfvénic mode can be used to estimate the spectral parameters of the IAR. The model has enabled us to compare the contributions into the IAR Q-factor of the Joule dissipation in the lower ionosphere and a wave leakage into the magnetosphere. The first mechanism dominates during daytime, whereas the latter mechanism prevails during nighttime. The ground signatures of IAR can be used for monitoring of the F-layer plasma density and vertical total electron content on the basis of relationships derived from the developed IAR model. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png "Acta Geodaetica et Geophysica" Springer Journals

Modeling diurnal variations of the IAR parameters

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Publisher
Springer Journals
Copyright
2016 Akadémiai Kiadó
ISSN
2213-5812
eISSN
2213-5820
DOI
10.1007/s40328-015-0158-9
Publisher site
See Article on Publisher Site

Abstract

Abstract Characteristic feature of the upper ionosphere is the occurrence of the ionospheric Alfvén resonator (IAR) and MHD waveguide, which can trap the electromagnetic waves in the frequency range from fractions of Hz to few Hz. The proposed numerical model is based on the solution of MHD equations in a realistic ionosphere, whose parameters are reconstructed from the IRI model. We estimated, both analytically and numerically, a critical, wave scale dependent, value of the Hall conductance when a wave equation for an uncoupled Alfvénic mode can be used to estimate the spectral parameters of the IAR. The model has enabled us to compare the contributions into the IAR Q-factor of the Joule dissipation in the lower ionosphere and a wave leakage into the magnetosphere. The first mechanism dominates during daytime, whereas the latter mechanism prevails during nighttime. The ground signatures of IAR can be used for monitoring of the F-layer plasma density and vertical total electron content on the basis of relationships derived from the developed IAR model.

Journal

"Acta Geodaetica et Geophysica"Springer Journals

Published: Dec 1, 2016

References