Physics
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.2935p&link_type=abstract
Journal of Geophysical Research, vol. 85, June 1, 1980, p. 2935-2940. Research supported by the Conselho Nacionale de Pesquisas
Physics
1
Auroras, Diurnal Variations, Neutral Sheets, Thermosphere, Wind Profiles, Altitude, Atmospheric Circulation, Coriolis Effect, Daytime, Electric Field Strength, Lithium, Lorentz Force, Mathematical Models, Navier-Stokes Equation, Plasma Density, Plasmasphere, Pressure Gradients, Viscosity
Scientific paper
Lithium trail neutral wind measurements have been made in the morning dayside auroral oval as a function of altitude. During all four experiments the winds displayed a large altitude shear. In the most extreme case the wind at 135-km altitude was toward the south at 210 m/s, and at 185-km altitude toward the northwest at 170 m/s. A one-dimensional numerical solution to the Navier Stokes equation including an initial steady-state wind profile, viscosity, pressure gradient, Lorenz force and the Coriolis force was made in order to study the effect of auroral processes on the neutral atmosphere. Since electric fields and plasma density were measured, the Lorenz force could be modeled with reasonable accuracy. The pressure gradient was determined in an iterative way as a best fit to the observations. Within the limitations of a one-dimensional model the numerical solution is in reasonable agreement with one of the observations, which is applicable to such a modeling, and indicates that both Lorenz forces and pressure gradients due to auroral processes are required to explain the observation.
Fuller-Rowell Tim J.
Jorgensen Stockflet T.
Kelley Michael C.
Mikkelsen Ib Steen
Pereira Eduardo
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