Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm31a10c&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM31A-10 INVITED
Physics
2700 Magnetospheric Physics, 2708 Current Systems (2409), 2744 Magnetotail, 2753 Numerical Modeling, 2788 Storms And Substorms
Scientific paper
Recent satellite observations indicate that the Earth's magnetotail is generally in a state of intermittent turbulence constantly intermixed with localized busty bulk flows (BBF) [Angelopoulos et al., J. Geophys. Res., 97, 4027, 1992; Lui et al., Geophys. Res. Lett., 15, 721, 1988]. A model of sporadic and localized merging of coherent structures has been proposed by Chang [Phys. Plasmas, 6, 4137, 1999] to describe the dynamics of the magnetotail. When conditions are favorable, the coherent structures may merge, interact, convect and evolve into forced and/or self-organized critical (FSOC) states [Chang, IEEE Trans. Plasma Sci., 20, 691, 1992], a condition satisfied by the observational statistics of the characteristics of the BBF [Angelopoulos, Phys. Plasmas, 6, 4161, 1999]. When considered with the realistic magnetotail geometry, the coarse-grained dissipation of turbulent fluctuations produced by the interacting multi-scale coherent structures may induce global nonlinear instabilities and possibly trigger substorms. Some of the above ideas have been demonstrated by direct numerical simulaions [Wu and Chang, Geophys. Res. Lett., 27, 863, 2000]. In this paper, we address the dynamics, particularly the preferential acceleration, of the coherent structures in a sheared magnetic field geometry. Preliminary comparisons of the theoretical ideas and new numerical results with the observed characteristics of BBF will also be presented.
Angelopoulos Vassilis
Chang Tsao
Wu Congjun
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