Auroral electromagnetic disturbances at altitudes of 900 km - Alfven wave turbulence

Details Auroral electromagnetic disturbances at altitudes of 900 km - Alfven wave turbulence Auroral electromagnetic disturbances at altitudes of 900 km - Alfven wave turbulence

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988p%26ss...36..949d&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 36, Oct. 1988, p. 949-962.

Computer Science

Sound

29

Auroral Zones, Magnetic Disturbances, Magnetohydrodynamic Waves, Plasma Turbulence, Space Plasmas, Electromagnetic Fields, Polar Orbits, Power Spectra, Satellite Sounding, Wave Interaction

Scientific paper

Measurements carried out at auroral latitudes on the ICB-1300 satellite have shown the existence of the Alfven wave turbulence. The properties of this turbulence resemble the properties of usual two-dimensional hydrodynamic turbulence (power law spectra with K = -2, vortex structure of the disturbances at different spectral intervals). A mechanism is proposed for the excitation of the turbulence that is related to the decay instability of a shear Alfven wave with finite amplitude. The approximations of a weak and a strong plasma turbulence are discussed.

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