Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43b1767p&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM43B-1767
Physics
Plasma Physics
[2764] Magnetospheric Physics / Plasma Sheet, [2788] Magnetospheric Physics / Magnetic Storms And Substorms, [7863] Space Plasma Physics / Turbulence
Scientific paper
Turbulent processes in the central palsma sheet during quiet and substorm time intervals have been studied using the tailward alignments of the THEMIS satellites. Fluctuations of the plasma bulk velocity and corresponding eddy-diffusion coefficients, and the level of intermittency using the Local Intermittency Measure thechnique were calculated using the simultaneous data obtained by the THEMIS satellites, situated inside the central plasma sheet between approximately 7 and 20 Earth's radii for quiet time intervals and for different substorm phases. It was found that the eddy diffusion values increase with the distance from the Earth in the tailward direction for both quiet and substrom time intervals. Nevertheless, it was also found that the values of eddy-diffusion coefficients increase a few times during substorms. These studies made it possible to create a three-dimensional distribution of the eddy-diffusion coefficients for quiet and substorm times and compare with those predicted by the Antonova and Ovchinnikov (1998) model for the turbulent plasma sheet dynamics during substorms.
Antonova Elizabeth E.
Pinto V. A.
Stepanova M. V.
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