Asymmetries produced in the mass loading of the magnetosphere during high dipole tilt and southward IMF

Details Asymmetries produced in the mass loading of the magnetosphere during high dipole tilt and southward IMF Asymmetries produced in the mass loading of the magnetosphere during high dipole tilt and southward IMF

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72b0629w&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72B-0629

Physics

2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling

Scientific paper

High dipole tilt events present important opportunities to investigate acceleration processes associated with magnetospheric/ionospheric coupling. One such event occurred on January 8, 1998 where the dipole tilt was large and significant O+ ions where observed downtail by Geotail. Multi-fluid simulations are used to examine this event, so that solar wind entry relative to ionospheric outflow can by distinctly identified. It is shown that the high dipole tilt leads to clear asymmetries in the solar wind entry occurring preferentially into the summer hemisphere and this preferential entry is seen through the inner and middle tail but not in the deep tail. The light ionospheric ions show a similar asymmetry with preferential mass loading of the summer hemisphere even into the deep tail. The story is very much more complicated for the heavy ions. While there may be preferential outflow from the summer hemisphere, they experience very much stronger dayside convection (due to their slower field-aligned velocity), and are then convected into the nightside winter hemisphere. This leads to strong O+ loading of the winter hemisphere with O+ becoming the dominant species in the nightside portion of the winter magnetotail.

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