Graduate School in Nonlinear Science
MIDIT OFD CATS
Modelling, Nonlinear Dynamics Optics and Fluid Dynamics Chaos and Turbulence Studies
and Irreversible Thermodynamics Risø National Laboratory Niels Bohr Institute and
Technical University of Denmark Building 128 Department of Chemistry
Building 321 P.O. Box 49 University of Copenhagen
DK-2800 Lyngby DK-4000 Roskilde DK-2100 Copenhagen Ø
Denmark Denmark Denmark
SELF-ORGANIZED TURBULENCE IN THE EARTH'S MAGNETOTAIL: CRITICAL
CURRENT SYSTEMS AND MAGNETOSPHERIC SUBSTORM ONSET
Alexander V. Milovanov
Space Research Institute
Thursday, April 26, 2001, 13.30 h
at OFD Meeting Room, Building 130, Risų National Laboratory
Structural properties of the magnetotail current systems near the marginal
nonequilibrium stationary state are analyzed in connection with the fractal
geometry of percolation near the critical threshold.
The strong magnetic field and plasma coupling at the marginal state is
described in terms of topologically conjugated fractals representing,
self-consistently, the turbulent magnetic field and current density
patterns in the magnetotail current sheet.
The violation of the conditions of critical percolation is shown to result
in a topological phase transition in the turbulent system. The phenomenon
has features enabling to associate it with the magnetospheric substorm onset.
A.V. Milovanov, L.M. Zelenyi, G. Zimbardo,
J. Geophys. Res. 101, 19,903 (1996).
A.V. Milovanov, L.M. Zelenyi, P. Veltri, G. Zimbardo, A.L. Taktakishvili,
J. Atm. Sol. Terr. Phys. 63, 705 (2001).
A.V. Milovanov, L.M. Zelenyi, G. Zimbardo, P. Veltri,
J. Geophys. Res. 106 (2001) (in press).