Tail Current Contribution to Dst during Major Storms

Details Tail Current Contribution to Dst during Major Storms Tail Current Contribution to Dst during Major Storms

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm41c..08s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM41C-08

Physics

2744 Magnetotail, 2753 Numerical Modeling, 2788 Storms And Substorms

Scientific paper

A question exists concerning the relative contributions of the ring current and the tail current to Dst during magnetic storms. In global MHD simulation, at least, as this talk shows, the tail current contribution can be significant. Global MHD simulations generate ring currents that are abnormally weak but tail currents that, judged by the size of the tail and by the strength of the tail field, are normally strong. If, therefore, global MHD simulation produces a sizable Dst, it is generated mostly by the tail current-an assumption that can be directly checked. The ISM MHD code is well suited for Dst studies since it computes the magnetic field everywhere in the solution domain from the base of the ionosphere to the outer, solar-wind boundaries of the code. A good determination of Dst can be obtained from the z-component of the magnetic field above the ionosphere at the poles. We report an analysis of the output of the ISM code for a run made to simulate conditions of the Bastille Day storm. We compare the ISM-determined polar cap potential and Dst against observed values. The polar cap potential agrees with DMSP measurements, and, surprisingly, ISM's Dst accounts for most of the observed maximum value.

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