The turbulence of Alfven waves in the polar magnetosphere of the earth

Details The turbulence of Alfven waves in the polar magnetosphere of the earth The turbulence of Alfven waves in the polar magnetosphere of the earth

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..761v&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, July 1989, p. 761-765.

Computer Science

23

Earth Magnetosphere, Energy Transfer, Magnetohydrodynamic Turbulence, Polar Regions, Electric Fields, Geomagnetism, Magnetic Fields, Power Spectra, Wave Interaction

Scientific paper

Effects of nonlinear interaction of sheared Alfven waves providing the energy transport from the distant magnetosphere to the auroral ionosphere are discussed. The decay interaction occurs both in a warm plasma and in a cold plasma. The growth rate of the decay instability is sufficiently large, and Alfven wave turbulence is excited. The excitation of convective plasma vortices and stationary field-aligned currents is also possible at high altitudes. In this case, the turbulence of Alfven waves becomes strong and resembles two-dimensional MHD-turbulence, characterized by power-law spectra of magnetic and electric fields. A comparison with satellite data is made.

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