Observations of intense velocity shear and associated electrostatic waves near an auroral arc

Details Observations of intense velocity shear and associated electrostatic waves near an auroral arc Observations of intense velocity shear and associated electrostatic waves near an auroral arc

Jun 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.2343k&link_type=abstract

Journal of Geophysical Research, vol. 82, June 1, 1977, p. 2343-2348.

Computer Science

Sound

18

Auroral Arcs, Electrostatic Waves, Magnetohydrodynamic Flow, S Waves, Velocity Distribution, Electric Fields, Javelin Rocket Vehicle, Long Wave Radiation, Magnetic Storms, Radiation Detectors, Rocket Sounding, Short Wave Radiation, Sounding Rockets, Spectrum Analysis

Scientific paper

Simultaneous measurements of energetic particles and ac electric fields made by the javelin sounding rocket NASA 8:56 during the late expansion phase of a magnetic storm have revealed an intense shear in plasma flow of magnitude 20 (m/s)/m at the edge of an auroral arc. Structure with two characteristic scales sizes is displayed in the region of shear. Larger structures are of the order of several kilometers in size. Intense irregularities with characteristic wavelengths smaller than the scale size of the shear have also been detected. The large-scale changes in the orientation of the charge sheet at the edge of the arc may be due to the Kelvin-Helmholtz branch; shorter-wavelength modes may be related to the shear driven resistive drift wave. Observations are consistent with the suggestion that velocity shear instabilities may play a role in the formation of high-latitude irregularities.

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