A comparative study of the time-dependent standard 8-, 13- and 16-moment transport formulations of the polar wind

Details A comparative study of the time-dependent standard 8-, 13- and 16-moment transport formulations of the polar wind A comparative study of the time-dependent standard 8-, 13- and 16-moment transport formulations of the polar wind

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..443b&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 6, p. 443-469.

Computer Science

Sound

33

Hydrogen Ions, Ionospheric Sounding, Momentum Transfer, Oxygen Ions, Plasma Pressure, Transport Properties, Ionospheric Electron Density, Satellite Sounding, Standards, Time Dependence

Scientific paper

The ionosphere, composed of O(+), H(+), and electrons is modeled with four different transport formulations. The equations corresponding to the standard set, the 8-, 13-, and 16-moment approximations are presented, and the collision terms are expressed. Using a time-dependent technique, the ionosphere is studied between altitudes of 200 and 8600 km. The production of electrons and O(+) ions is described by a neutral atmosphere simplified photoionization scheme, while the energy deposition is supported by a downward electron heat flow of -0.005 erg/sq cm per s imposed at the topside boundary. When the models reach a steady state equilibrium, the electron solutions show differences due to the introduction of temperature anisotropies and heat flows between the components parallel and perpendicular to the magnetic field. As a corollary, the ions show structures depending on the level of approximation. A depletion of a factor of 10 is then applied to the ion densities above a certain altitude, and the development of the perturbation is followed for 1000 s for all the models.

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