Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm71a0569h&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SM71A-0569
Physics
2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2753 Numerical Modeling, 2760 Plasma Convection, 2788 Storms And Substorms
Scientific paper
We have studied the formation of thin current sheets during the growth phase of magnetospheric substorms. Our approach is based on the conservation of entropy on magnetic flux tubes during the slow quasi-static evolution of the magnetosphere. The growth phase is initiated by the erosion of closed dayside magnetic flux. This flux is replenished by convection of closed magnetic flux from the near-Earth tail region to the dayside. However, the entropy constraint implies that this reservoir of magnetic flux is finite [since no flux can be convected from the mid- and far-tail region (Erickson and Wolf, 1980)]. We argue that the depletion of flux in the near-Earth tail region leads to the observed current sheet thinning. We use three-dimensional MHD simulations to model the formation of the thin current sheet in the near-Earth region during the late growth phase of substorms.
Hall F. F.
Otto Andreas
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