Physics
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40..585r&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 40, May 1978, p. 585-599.
Physics
1
Auroral Zones, Diurnal Variations, Ion Motion, Thermosphere, Wind Effects, Barium Ion Clouds, Convective Flow, Coriolis Effect, Ionosondes, Magnetometers, Resistance Heating, Wind Velocity Measurement
Scientific paper
Twilight measurements of thermospheric winds on the basis of barium releases have demonstrated drifts in a consistent westward sense; this is at variance with global pressure modes and is associated with the proximity of auroral zone sources. The present paper develops a simple model of the auroral zone, with parameters chosen to reproduce gross magnetometer and ionosonde observations on particular days. A theoretical description of thermosphere dynamics is examined, giving rise to comparable wind velocities for each of five barium releases. Assuming a local origin for electric fields derived from neutral velocity differences between altitudes, the low ion-neutral separation drifts, also observed in the twilight experiments, are reproduced. The neutral winds are consistent with a Joule heating mechanism, coupled to convective ion drag and Coriolis effects, for spreading auroral influences to lower latitudes.
Baxter A. J.
Roper P. W.
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