Two-stream modeling of plasmaspheric refilling

Details Two-stream modeling of plasmaspheric refilling Two-stream modeling of plasmaspheric refilling

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...100.9519g&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A6, p. 9519-9526

Physics

7

Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions, Magnetospheric Physics: Storms And Substorms, Magnetospheric Physics: Numerical Modeling

Scientific paper

Plasmaspheric refilling on an L=4 flux tube was studied by using a time-dependent, hydrodynamic plasmaspheric flow model in which the ion streams from the two hemispheres are treated as distinct fluids. In the model the continuity, momentum, and energy equatins of a two-ion (O+ and H+), quasi-neutral, currentless plasma are solved along a closed geomagnetic field line; diffusive equilibrium is not assumed. Collisions between all stream pairs and with neutral species are included. The model includes a corotating, tilted dipole magnetic field and neutral winds. Ionospheric sources and sinks are accounted for in a self-consistent manner. Electrons are assumed to be heated by photoelectrons. The model flux tube extends from 200-km altitude in one hemisphere to 200-km altitude in the other hemisphere. Initially, the upwelling streams pass through each other practically unimpeded. When the streams approach the boundary in the conjugate ionosphere, a shock develops there, which moves upward and dissipates slowly; at about the same time a reverse shock develops in the hemisphere of origin, which moves upward. After about 1 hour, large shocks develop in each stream near the equator; these shocks move toward the equator and downward after crossing the equator. However, these shocks are probably artificial, because counterstreaming flows occur in each H+ fluid, which the model can only handle by creating shocks.

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