Realistic Plasma Sheet Models: Kinetic Reconstructions Using Cluster

Details Realistic Plasma Sheet Models: Kinetic Reconstructions Using Cluster Realistic Plasma Sheet Models: Kinetic Reconstructions Using Cluster

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm24a..01c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM24A-01

Other

2744 Magnetotail, 2764 Plasma Sheet, 7827 Kinetic And Mhd Theory, 7833 Mathematical And Numerical Techniques (0500, 3200), 7894 Instruments And Techniques

Scientific paper

The Harris model has served for many years as the de-facto standard kinetic model for the tail plasma sheet. However, the model only rarely agrees with detailed satellite observations beyond roughly fitting the current profile. We present a reconstruction technique which can be used to fit the generalized quasi-isotropic class of models (which includes the Harris model and many others) to Cluster data. The resulting time-stationary reconstructions are self-consistent, with kinetic ions and fluid-like electrons. We apply the reconstruction technique to 30 Cluster plasma sheet crossings when the scale size was comparable to the ion inertial length. The 30 reconstructions show 3 different typical cases. Most commonly, the current is carried by diamagnetic ion currents, with small embedded perturbations from electron currents. Less common are thin, bifurcated sheets driven by electron Hall currents. A few cases are supported by anisotropic electron currents. The reconstructions point out the essential properties of a realistic plasma sheet model, and give insight into the stable thin current sheets that provide the initial conditions for reconnection and/or current disruption

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