High-resolution sounding rocket observations of large-amplitude Alfven waves

Details High-resolution sounding rocket observations of large-amplitude Alfven waves High-resolution sounding rocket observations of large-amplitude Alfven waves

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....9512157b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, Aug. 1, 1990, p. 12157-12171.

Computer Science

Sound

117

Auroral Zones, Magnetohydrodynamic Waves, Rocket Sounding, S Waves, Wave Propagation, Electron Flux Density, Electron Precipitation, Step Functions

Scientific paper

Shear Alfven waves with amplitudes greater than 100 mV/m were observed on two recent sounding rocket flights. The largest waveforms are best described as a series of step functions, rather than as broadband noise or as single frequency waves. Complete two-dimensional E and B measurements at 4-ms time resolution were made, showing a downward propagation direction and implying insignificant reflection from the ionosphere at frequencies greater than 1 Hz. Intense, field-aligned, low-energy electron fluxes accompany the waves. Acceleration of these electrons by the Alfven waves is shown to be feasible. The waves in at least one case have a sufficently large ponderomotive potential to generate the observed density fluctuations of order one.

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