The spectral form of small-scale plasma turbulence in the auroral ionosphere

Computer Science – Sound

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Auroral Zones, Ionospheric Electron Density, Plasma Turbulence, Space Plasmas, Spectrum Analysis, Upper Ionosphere, Geomagnetism, Microwave Transmission, Plasma Density, Satellite Sounding, Scintillation, Spitsbergen (Norway)

Scientific paper

The spectra of amplitude fluctuations have been determined using 400 MHz transmissions from the Navy Navigation Satellite System observed at Spitsbergen. A spectrum model for electron density fluctuations is discussed. Two forms of the spectrum for the inertial interval are determined from observations of satellite signal scintillations at different angles between the position vector of the satellite and the geomagnetic field lines. A three-dimensional spectrum is modeled from one of the forms, and the typical spectrum cut-off scale is defined as the longitudinal dissipation scale approximately equal to 5 - 15 km in the direction of the geomagnetic field.

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