3D MHD reconnection model coupled with Cluster multi-spacecraft data

Details 3D MHD reconnection model coupled with Cluster multi-spacecraft data 3D MHD reconnection model coupled with Cluster multi-spacecraft data

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11303205w&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A3, CiteID A03205

Physics

Plasma Physics

1

Space Plasma Physics: Magnetic Reconnection (2723, 7526), Space Plasma Physics: Mathematical And Numerical Techniques (0500, 3200), Space Plasma Physics: Instruments And Techniques, Space Plasma Physics: Transport Processes

Scientific paper

We present a model where a three-dimensional viscous/resistive analytical model of the large scale plasma flow in the outflow region about a reconnection site at the dayside magnetopause, is coupled with multispacecraft measurements from the Cluster satellite armada. A total of ten magnetopause crossings have been analyzed during the period 10:29-11:05 UT 26 January 2001, where nine are shown to be suitable to be coupled with the analytical model. Five of these nine reconnection events results in a successful coupling. By fitting the analytical expressions of the plasma velocity and magnetic field behavior during the transition of the magnetopause, with data from the Cluster spacecraft we obtain estimates of the location of the X-line together with estimates on the anomalous transport coefficients of kinematic viscosity (ν) and magnetic diffusivity (η d ). We also obtain the development of the magnetopause transition layer away from the X-line. It is shown that the distance from the spacecraft to the X-line varies between 0.01 and 1 Earth radii, while ν + η d have a value between 4 . 104 km2/s and 4 . 106 km2/s. Furthermore it is shown that the transition layer thickness follows the analytical pattern where it grows proportional to the square root of the distance from the reconnection site. The estimated thickness obtained from each spacecraft is shown to follow the analytical structure well.

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