Modeling of Current Sheet Dynamics Observed by THEMIS

Details Modeling of Current Sheet Dynamics Observed by THEMIS Modeling of Current Sheet Dynamics Observed by THEMIS

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51b2101k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51B-2101

Physics

[2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2744] Magnetospheric Physics / Magnetotail, [2790] Magnetospheric Physics / Substorms

Scientific paper

For several days in early 2009 the orbits of the THEMIS probes fortuitously aligned such that they were approximately co-located in X and Y, but distributed in Z by 1-2 Earth radii such that the constellation bracketed the nightside current sheet. These conjunctions enable a time dependent modeling of current sheet behavior during geomagnetically active intervals. During the conjunctions we have calculated using a Harris model the time history of the current sheet parameters, such as scale height and current density, in the near-Earth region. The Harris model adequately describes both the observed magnetic field and thermal pressure profiles for the majority of the intervals. However, significant deviations do occur, primarily during extended substorm growth phase intervals. We suggest that these intervals represent bifurcated current sheets that sometimes form during current sheet thinning. The THEMIS observations enable a time-dependent modeling of the bifurcation, including location and thickness of the bifurcated layers. We further compare the THEMIS observations with the results of particle-in-cell simulations.

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