Influence of cusp O+ outflow on magnetotail dynamics in a multifluid MHD model of the magnetosphere

Details Influence of cusp O+ outflow on magnetotail dynamics in a multifluid MHD model of the magnetosphere Influence of cusp O+ outflow on magnetotail dynamics in a multifluid MHD model of the magnetosphere

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11500j05w&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue 12, CiteID A00J05

Physics

7

Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Substorms, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions (2431), Magnetospheric Physics: Cusp, Magnetospheric Physics: Magnetospheric Configuration And Dynamics

Scientific paper

A multifluid version of the Lyon-Fedder-Mobarry global simulation model has been used to investigate the effects of outflowing ionospheric O+ on the magnetosphere-ionosphere system. To quantify these effects, we specify the number density, upward parallel velocity, and temperature of the O+ outflow in a limited area of the low-altitude simulation boundary representing the projection of cusp, cleft, and low-latitude boundary layer. A baseline simulation without O+ outflow is compared with simulations with a range of fluxes and initial velocities. In the cases with high fluxes, it is shown that the configuration of the magnetosphere is dramatically changed. In particular, the cross-polar cap potential is reduced, the polar cap area is increased, and the nightside reconnection line is moved earthward. Furthermore, in one case, the O+ outflow leads to the onset of a second substorm not seen in the other simulation runs.

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