Study of the Preferential Acceleration and Merging of Coherent Structures, BBF and Intermittent Turbulence in Earth's Magnetotail

Details Study of the Preferential Acceleration and Merging of Coherent Structures, BBF and Intermittent Turbulence in Earth's Magnetotail Study of the Preferential Acceleration and Merging of Coherent Structures, BBF and Intermittent Turbulence in Earth's Magnetotail

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.

Affiliated with

Also associated with

No associations

Rating

Study of the Preferential Acceleration and Merging of Coherent Structures, BBF and Intermittent Turbulence in Earth's Magnetotail does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Study of the Preferential Acceleration and Merging of Coherent Structures, BBF and Intermittent Turbulence in Earth's Magnetotail, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Study of the Preferential Acceleration and Merging of Coherent Structures, BBF and Intermittent Turbulence in Earth's Magnetotail will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1277055