Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43b1766s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM43B-1766
Physics
Plasma Physics
[2764] Magnetospheric Physics / Plasma Sheet, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7839] Space Plasma Physics / Nonlinear Phenomena, [7863] Space Plasma Physics / Turbulence
Scientific paper
Recent studies has been shown the importance of turbulent processes for the development of self-consistent approach for the dynamics of the magnetosphere of the Earth, in particular, for the analysis of the stability of turbulent plasma sheet. Fluctuations of the plasma bulk velocity were deduced from the measurements on board Interball/Tail, Cluster, Geotail, and Themis satellites. It was found that the plasma sheet flow generally appears to be strongly turbulent, i.e. dominated by fluctuations that are unpredictable. Corresponding eddy-diffusion coefficients were derived using the autocorrelation time and rms velocity. Variations of eddy-diffusion coefficients and particle density across and along the plasma sheet were studied, determining the characteristic values of eddy diffusion and of particle density as well as the thickness of the plasma sheet. The results obtained have been used for direct verification of the Antonova and Ovchinnikov (1996, 1998, 1999) theory of the plasma sheet formation, according to which a compact and comparatively stable turbulent plasma sheet can be formed when the regular plasma transport related to the regular dawn-dusk electric field across the plasma sheet is compensated by the eddy diffusion turbulent transport. When the turbulent fluctuations act to expand the plasma sheet, the large-scale electrostatic dawn-dusk electric field counteracts to compress it, similarly to the case of the laboratory pinch which is compressed by the induction electric field. When the expansion and compression compensate each other, a stationary structure is formed. Our results have shown that this theory reproduces the dynamics of the turbulent plasma sheet, including its thickness, within the accuracy of parameters used.
Antonova Elizabeth E.
Stepanova M. V.
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