Effects of solar and geomagnetic activities on the sub-ionospheric very low frequency transmitter signals received by the DEMETER micro-satellite

Boudjada, M. Y.; Schwingenschuh, K.; Al-Haddad, E.; Parrot, M.; Galopeau, Patrick H. M.; Besser, Bruno P.; Stangl, G.; Voller, W.

doi:10.4401/ag-5463

Cited by 2 publications

(1 citation statement)

References 22 publications

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“…Other solar indexes were considered, like sunspots and solar radio flux, in investigating VLF radio propagation in periods of high solar activity. Hence, a correlation degree of about 40 % was found between the transmitter amplitude signals and sunspot index (Boudjada et al, 2012).…”

Section: Introductionmentioning

confidence: 90%

Case study of radio emission beam associated to very low frequency signal recorded onboard CSES satellite

et al. 2023

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Abstract. We report on the variation of electric power density linked to very low frequency (VLF) signal observed during the minimum of solar cycle 25. The detected VLF signal is emitted by the NWC radio station localized in the southern hemisphere, at 21.5∘ S and 114.2∘ E. We attempt in this work to quantify the beam as detected by the Electric Field Detector (EFD) instrument onboard CSES satellite. Geometrical key parameters have been considered to analysis the variation of the power density taking into consideration the distance between the satellite trajectory and the NWC station and its conjugate region. The beam behavior is found to be subject to significant disturbances in the conjugate region with the presence of signal modulations. Above the NWC transmitter station, the beam can be considered as a hollow cone but with irregularity dependence on the electric power density.

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Section: Introductionmentioning

confidence: 90%

Case study of radio emission beam associated to very low frequency signal recorded onboard CSES satellite

et al. 2023

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Model of the propagation of very low-frequency beams in the Earth–ionosphere waveguide: principles of the tensor impedance method in multi-layered gyrotropic waveguides

Rapoport

Grimalsky²,

Fedun

et al. 2020

Ann. Geophys.

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Abstract. The modeling of very low-frequency (VLF) electromagnetic (EM) beam propagation in the Earth–ionosphere waveguide (WGEI) is considered. A new tensor impedance method for modeling the propagation of electromagnetic beams in a multi-layered and inhomogeneous waveguide is presented. The waveguide is assumed to possess the gyrotropy and inhomogeneity with a thick cover layer placed above the waveguide. The influence of geomagnetic field inclination and carrier beam frequency on the characteristics of the polarization transformation in the Earth–ionosphere waveguide is determined. The new method for modeling the propagation of electromagnetic beams allows us to study the (i) propagation of the very low-frequency modes in the Earth–ionosphere waveguide and, in perspective, their excitation by the typical Earth–ionosphere waveguide sources, such as radio wave transmitters and lightning discharges, and (ii) leakage of Earth–ionosphere waveguide waves into the upper ionosphere and magnetosphere. The proposed approach can be applied to the variety of problems related to the analysis of the propagation of electromagnetic waves in layered gyrotropic and anisotropic active media in a wide frequency range, e.g., from the Earth–ionosphere waveguide to the optical waveband, for artificial signal propagation such as metamaterial microwave or optical waveguides.

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Effects of solar and geomagnetic activities on the sub-ionospheric very low frequency transmitter signals received by the DEMETER micro-satellite

Cited by 2 publications

References 22 publications

Case study of radio emission beam associated to very low frequency signal recorded onboard CSES satellite

Case study of radio emission beam associated to very low frequency signal recorded onboard CSES satellite

Model of the propagation of very low-frequency beams in the Earth–ionosphere waveguide: principles of the tensor impedance method in multi-layered gyrotropic waveguides

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