Cluster: Bifurcated Current Sheets and Substorm Dynamics

Details Cluster: Bifurcated Current Sheets and Substorm Dynamics Cluster: Bifurcated Current Sheets and Substorm Dynamics

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm21b0199t&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM21B-0199

Physics

2744 Magnetotail, 2748 Magnetotail Boundary Layers, 2764 Plasma Sheet

Scientific paper

We report on the evidence for "bifurcated" current sheets in the near-Earth plasma sheet and the possible association of such current sheets with substorm processes. Recent studies using Cluster data have shown evidence for current sheets with two current density peaks rather than a single current density peak as expected for a Harris-type configuration. We will present a statistical search for such bifurcated current density profiles and examine whether such intervals are associated with substorm onsets in the near-Earth plasma sheet. If such bifurcations are associated with onsets, it is possible a double-peaked current density profile is evidence for the structuring of the current expected near a reconnection X-line. As an introduction, a test of the macroscopic consistency of current densities relative to changes in the magnetic field will be presented. We find that the current densities measured with Cluster are often quite reliable.

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