VLF waves - Conjugated ground-satellite relationships

Physics

Scientific paper

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Earth Magnetosphere, Geos 1 Satellite, Ground Stations, Radio Emission, Satellite Observation, Very Low Frequencies, Cold Plasmas, Extremely Low Radio Frequencies, Ionospherics, Magnetospheric Electron Density

Scientific paper

Results in the VLF range obtained by an intercomparison between signals recorded at the GEOS satellite and the French ground station at Hufasell, Iceland (July-September 1977) are examined. VLF emissions were observed to present in many occasions identical variations in amplitude, with a very abrupt and very large (more than 20 dB) decrease in amplitude. Further, the abrupt changes in the VLF intensity were in some cases found to be associated with the appearance and disappearance of strong ULF emissions in the Pc-1 frequency range. More quantitative studies, though, are needed for a better understanding of the generation process of VLF emissions and its interrelation with ULF turbulence as well as with ionospheric properties and local plasma parameters.

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