Orientation and motion of a discontinuity from Cluster curlometer capability: Minimum variance of current density

Details Orientation and motion of a discontinuity from Cluster curlometer capability: Minimum variance of current density Orientation and motion of a discontinuity from Cluster curlometer capability: Minimum variance of current density

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3110804h&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 10, CiteID L10804

Physics

Plasma Physics

11

Magnetospheric Physics: Magnetopause, Cusp, And Boundary Layers, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Space Plasma Physics: Discontinuities, Space Plasma Physics: Instruments And Techniques

Scientific paper

A new technique to derive magnetopause key parameters such as orientation, velocity and thickness from multi-spacecraft observations is presented. The method is based on four-spacecraft determination of the current density, variance analysis to estimate the orientation and thereafter integration of the current density across the magnetopause to find the velocity. In cases where the spacecraft separation distance is small compared to the magnetopause thickness, the method can have advantages compared to other multi-spacecraft techniques. We show an application to Cluster data and compare the results with those from other multi-spacecraft methods as well as single-spacecraft methods such as minimum variance of the magnetic field combined with deHoff-mann-Teller analysis and the minimum Faraday residue method. Our results indicate that under favorable conditions, the use of Cluster as a curlometer can be very successful.

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