Supersonic neutral winds in an outer atmosphere. I Isothermal conditions. II - Effects of variable temperature

Details Supersonic neutral winds in an outer atmosphere. I Isothermal conditions. II - Effects of variable temperature Supersonic neutral winds in an outer atmosphere. I Isothermal conditions. II - Effects of variable temperature

Aug 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974aujph..27..511g&link_type=abstract

Australian Journal of Physics, vol. 27, Aug. 1974, p. 511-540. Research supported by the Australian Research Grants Committee.

Other

Atmospheric Circulation, Isothermal Processes, Nozzle Flow, Supersonic Flow, Temperature Effects, Upper Atmosphere, Astronomical Models, Critical Point, Gas Dynamics, Geomagnetism, Gravitational Effects, Helium Atoms, Hydrogen Atoms, Nitrogen Atoms, Oxygen Atoms, Planetary Atmospheres, Stellar Atmospheres, Wind Velocity

Scientific paper

The concept of steady nozzle flow along a narrow tube is applied to the motion of neutral gas constituents in a locally heated isothermal region of the outer atmosphere of a planet or star. The artificial nozzle throat at which the flow becomes supersonic is achieved by using one of two streamline functions within a vertical plane suggested by the possible shapes of convection cells. One streamline spirals above the surface of the planet at constant elevation, and the other 'bends over' asymptotically towards the horizontal. The former achieves the nozzle throat by the gravitational force decreasing with distance from the centre of the planet, while the latter relies on the gravitational component along the streamline decreasing as the streamline approaches the horizontal. Conditions under which the effects of viscosity and frictional interactions in the earth's atmosphere may be neglected from the assumed hydrodynamic description are considered.

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