Ion outflow in a dynamic coordinate frame.

Details Ion outflow in a dynamic coordinate frame. Ion outflow in a dynamic coordinate frame.

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71b..09a&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM71B-09

Physics

Plasma Physics

2736 Magnetosphere/Ionosphere Interactions, 7800 Space Plasma Physics

Scientific paper

The ionosphere contributes a significant and variable flux of ions to the magnetosphere, primarily of low energy ions. The transport and energization of these ions play a important and poorly understood role in dynamic processes such as substorms. Progress in understanding the role of ionospheric ions requires incorporating realistic models of ion outflow into global magnetospheric models. Prior reports of ion outflow have used the static geomagnetic coordinate system. In this presentation the ion outflow observed during 1997 (solar minimum) from the FAST satellite is analyzed with the respect to the auroral oval, removing the effects of auroral motion in response to geomagnetic activity. The location of auroral oval is identified from both electron and ion measurements. Within the auroral oval, the ion outflow is then statistical analyzed with respect to the ion characteristics (i.e. beams and conics) and global parameters such as altitude and magnetic activity. In the dynamic boundary oriented coordinate system, we find that ion beams near midnight are found uniformly distributed across the auroral oval. Ion conics at midnight, however, are observed primarily near the poleward boundary of the auroral oval. We will report on these and other features observed in our initial assessment of this new and unique data set.

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