Simultaneous observations of neutral winds and electric fields at spaced locations in the dawn auroral oval

Details Simultaneous observations of neutral winds and electric fields at spaced locations in the dawn auroral oval Simultaneous observations of neutral winds and electric fields at spaced locations in the dawn auroral oval

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9417235l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 17235-17243. Research supported by the Danish Space

Computer Science

Sound

17

Auroral Zones, E Region, Electric Fields, F Region, Wind Measurement, Wind Profiles, Electron Density (Concentration), Magnetic Storms, Rocket Sounding, Vorticity

Scientific paper

Results are presented on simultaneous observations of neutral winds and electric fields at spaced locations in the dawn auroral oval, carried out during a chemical release experiment on March 21, 1987. The observed plasma drifts and electron densities indicated the presence of a significant coupling between plasma and neutrals at the altitude of the F region but little coupling in the lower E region. The wind variations in the height range between 95 and 130 km were suggestive of the variations and amplitudes expected if the flow was dominated by the semidiurnal tide. However, a comparison of the flow with the model developed by Forbes (1982) showed that the phase differs by 4-5 hours from the predictions. Moreover, the measured divergence and vorticity in the flow are much larger than those predicted by the model, indicating that higher-order modes than those treated by Forbes may contribute significantly to the high-latitude thermospheric flow.

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