Title :
Dynamical evolution of coherent structures in intermittent two-dimensional MHD turbulence
Author :
Wu, C.C. ; Chang, Tom
Author_Institution :
Dept. of Phys. & Astron., California Univ., Los Angeles, CA, USA
fDate :
12/1/2000 12:00:00 AM
Abstract :
Recent satellite observations indicate that the Earth´s magnetotail is generally in a state of intermittent turbulence. A model of sporadic localized merging of coherent structures has recently been proposed by Chang to describe the dynamics of the Earth´s magnetotail. The authors report the results of MHD simulations regarding the development and merging of two dimensional coherent structures. With a magnetic shear, such coherent structures are generated in alignment with the imposed current sheet. The calculated fluctuation spectra suggest long-ranged correlations with power-law characteristics
Keywords :
magnetosphere; plasma magnetohydrodynamics; plasma turbulence; MHD simulation; MHD turbulence; coherent structure; dynamical evolution; dynamics; fluctuation spectra; imposed current sheet; intermittent turbulence; intermittent two-dimensional turbulence; long-ranged correlation; magnetic shear; magnetic tail; magnetosphere; magnetotail; plasma turbulence; power-law characteristics; sporadic localized merging; Computational modeling; Computer simulation; Equations; Fluctuations; Magnetic fields; Magnetohydrodynamics; Magnetosphere; Merging; Plasma density; Space technology;
Journal_Title :
Plasma Science, IEEE Transactions on
