Dynamical Structure of the Cross-tail Current Sheet During Substorms Observed by Cluster

Details Dynamical Structure of the Cross-tail Current Sheet During Substorms Observed by Cluster Dynamical Structure of the Cross-tail Current Sheet During Substorms Observed by Cluster

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm23b0426a&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM23B-0426

Physics

2721 Field-Aligned Currents And Current Systems (2409), 2740 Magnetospheric Configuration And Dynamics, 2764 Plasma Sheet, 2790 Substorms

Scientific paper

We report on the dynamical variation of the current sheet structure in the magnetotail using magnetic field and plasma data obtained by the Cluster multi-satellites. It is found that in some cases the thickness of the cross-tail current sheet shows temporal variations repeatedly. This sausage-mode-like variation is associated with substorm onsets or occurrence of fast plasma flows, with the time scale of several minutes before substorm onsets or fast flows and of a half to one minute afterwards. It frequently coexists with kink-mode-like wave or flapping motion. Such sausage-mode-like variation is mainly observed in the central part of the plasma sheet, and forms transient bifurcated currents or the intense current in the center.

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