Fitting of hydrodynamic and kinetic solar wind models

Details Fitting of hydrodynamic and kinetic solar wind models Fitting of hydrodynamic and kinetic solar wind models

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..201b&link_type=abstract

Planetary and Space Science, vol. 25, Feb. 1977, p. 201-203.

Other

2

Hydrodynamic Equations, Kinetic Equations, Magnetohydrodynamic Flow, Solar Wind Velocity, Transport Theory, Knudsen Flow, Mean Free Path, Solar Corona, Subsonic Flow

Scientific paper

In isothermal models of the expanding solar corona there exists in general an exobase level where the collision mean free path becomes equal to the density scale height. At this level the hydrodynamic approximations of the transport equations fail to be justified, and a kinetic approach is more appropriate. This exobase is located below the altitude of the critical point proper to the hydrodynamic solutions. The bulk velocity at the exobase is subsonic and smaller than the expansion velocity at the critical point. Therefore, the transition to a supersonic solar-wind velocity occurs in the collisionless ion-exosphere.

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