Computer Science – Sound
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84..917r&link_type=abstract
Journal of Geophysical Research, vol. 84, Mar. 1, 1979, p. 917-930.
Computer Science
Sound
6
Electrostatic Waves, Magnetopause, Magnetosheath, Magnetospheric Instability, Plasma Sheaths, Turbulence, Bow Waves, Correlation, Electron Plasma, Plasma Density, Plasma Oscillations, Plasma-Particle Interactions, Shock Waves, Solar Wind, Threshold Currents, Ultrasonic Spectroscopy
Scientific paper
The spectrum of electrostatic wave turbulence in the terrestrial magnetosheath is investigated. Measurements of electric and magnetic field fluctuations in the range 20 Hz to 200 kHz were made by two 16-channel spectrum analyzers on board the IMP 6 satellite. It is found that the electrostatic wave spectra generally consist of three components, which may occur in any combination: a low frequency component which shows a decrease in spectral density with increasing frequency and which is associated with the bow shock wave, a high frequency component identified with electron plasma oscillations and an intermediate frequency component. The minimum wavelength of electrostatic waves is found to be about 0.1 km, with intensity of from 0.01 to 1.0 mV/m. Electric field polarization has been found to be parallel to the local magnetic field direction, implying the presence of longitudinal electrostatic wave modes, electron plasma oscillations and ion sound waves.
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