Connections between large-scale transport to the inner magnetosphere from the distant plasma sheet, region 2 coupling to the ionosphere, and substorm and storm dynamics (Invited)

Details Connections between large-scale transport to the inner magnetosphere from the distant plasma sheet, region 2 coupling to the ionosphere, and substorm and storm dynamics (Invited) Connections between large-scale transport to the inner magnetosphere from the distant plasma sheet, region 2 coupling to the ionosphere, and substorm and storm dynamics (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm13e..07l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM13E-07

Physics

[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2790] Magnetospheric Physics / Substorms

Scientific paper

Studies using a variety of ground-based and spacecraft observations, as well as the Rice Convection Model, have taught us much about the connection between plasma sheet transport and particle distributions within the inner plasma sheet. These studies have shown that plasma moves earthward (equatorward in the ionosphere) after enhancements in convection to reach the near-Earth plasma sheet, leading to the enhancements in plasma sheet pressure that are responsible for the growth phase of substorms and the partial ring current. The highest inner plasma sheet pressures likely occur in the subauroral polarization streams (SAPS) region of the evening-side convection cell, lying equatorward of the Harang reversal. Both the Harang reversal and SAPS are manifestations of the region 2 (R2) electrodynamical coupling, so that transport to the near-Earth plasma sheet is strongly influenced by the R2 magnetosphere-ionosphere coupling. Modeling results show that this transport, together with the concurrent R2 coupling, is also strongly dependent on the plasma distributions that enter the plasma sheet. However, the entering plasma distribution is expected to have substantial spatial and temporal structure, which should impart substantial spatial structure and time dependencies to the inner plasma sheet particle distributions. In addition, very recent analyses indicate that the temporal variations of the particle distribution entering the plasma sheet, and the ensuing transport of new particle distributions within the plasma sheet, is fundamental to understanding the substorm expansion phase. Taken together, the above results indicate that an important understanding of inner magnetosphere particle distributions and their dynamics, as well as of major geomagnetic disturbances, is likely to come from integrated studies of plasma sheet particle entry, particle transport, and electrodynamical coupling to the ionosphere.

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