MHD turbulence generated by time-varying field-aligned currents

Details MHD turbulence generated by time-varying field-aligned currents MHD turbulence generated by time-varying field-aligned currents

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9211225c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Oct. 1, 1987, p. 11225-11230.

Computer Science

Sound

15

Electric Current, Electromagnetic Pulses, Field Aligned Currents, Geomagnetism, Magnetohydrodynamic Turbulence, Magnetohydrodynamic Waves, Auroral Zones, Current Density, Magnetohydrostatics, Satellite Sounding

Scientific paper

The MHD turbulence driven by time-varying field-aligned currents is calculated. It is shown that a current pulse with a parallel velocity of the order of or smaller than the Alfven velocity can generate kinetic Alfven waves. These results are applied to the interpretation of magnetic pulses observed in the auroral zone by low-altitude polar satellites. They provide a challenge to the usual interpretation in terms of a crossing by a spacecraft of static structures of thin parallel-current sheets.

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