Comparison of the Current Sheet Thickness as Determined Using Nonlinear Dynamics Modeling and Cluster Measurements

Details Comparison of the Current Sheet Thickness as Determined Using Nonlinear Dynamics Modeling and Cluster Measurements Comparison of the Current Sheet Thickness as Determined Using Nonlinear Dynamics Modeling and Cluster Measurements

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm52a..04h&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM52A-04

Statistics

Methodology

2744 Magnetotail, 2764 Plasma Sheet, 2794 Instruments And Techniques, 3220 Nonlinear Dynamics, 7839 Nonlinear Phenomena

Scientific paper

Computer simulations of nonlinear charged particle dynamics in magnetotail like magnetic fields have pointed towards the existence of an ion distribution function signature that manifests itself as a serried of peaks and valleys. The separation of the peaks has been shown to scale as the fourth root of the normalized energy, where the normalization in turn depends on the parameters that describe the magnetic field structure, i.e. the current sheet half-thickness and the ratio of the magnetic field strength at the mid-plane to the asymptotic magnetic field strength. Using ion distributions functions and magnetic field data from the GEOTAIL spacecraft, it has been shown that this signature may be used to determine the quiet-time (Kp < 2-) current sheet thickness. Recently we have completed a survey of the current sheet structure in the region -100RE < XGSE< -20 RE. and found that the current sheet structure in remarkably constant throughput the entire region with a scale length of approximately 0.8 RE . In this paper, we compare the thickness measured by using nonlinear dynamics modeling with that made by direct measurements of the thickness using the four Cluster satellites in the vicinity of XGSE= -20 RE. This effectively serves as a benchmark for the veracity of the nonlinear modeling methodology.

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