Evidence for intermittency in Earth’s plasma sheet and implications for self-organized criticality

It has been proposed recently that a description of the magnetosphere as a system in a state of self-organized criticality would be fruitful for understanding (and predicting) the global response to solar wind input. In this paper it is shown that the proposed description fits the characteristics of magnetotail plasma flows and their variability. According to observations, the magnetotail is in a bi-modal state: nearly stagnant, except when driven turbulent by transport-efficient fast flows. The distributions of flows are in agreement with sporadic (intermittent) variability in the magnetotail. The variability may resemble hydrodynamic turbulence around a jet. The presence of turbulence alters the conductivity and the mass/momentum diffusion properties across the plasma sheet and may permit cross-scale coupling of localized jets into a global perturbation. Bursty-flow-driven turbulence is a physical process that may have an important role to play in the establishment of a state of self-organized criticality.

[1]  P. Bak,et al.  Self-organized criticality. , 1988, Physical review. A, General physics.

[2]  William H. Press,et al.  Numerical recipes , 1990 .

[3]  Tang,et al.  Self-Organized Criticality: An Explanation of 1/f Noise , 2011 .

[4]  Richard W. McEntire,et al.  Magnetotail flow bursts: Association to global magnetospheric circulation, relationship to ionospheric activity and direct evidence for localization , 1997 .

[5]  Nobuyuki Kaya,et al.  The Low Energy Particle (LEP) Experiment onboard the GEOTAIL Satellite , 1994 .

[6]  Wolfgang Baumjohann,et al.  Convection and Substorms , 1996 .

[7]  John D. Craven,et al.  Features of steady magnetospheric convection , 1994 .

[8]  V. A. Sergeev,et al.  Steady magnetospheric convection: A review of recent results , 1996 .

[9]  A. Kolmogorov.  A refinement of previous hypotheses concerning the local structure of turbulence in a viscous incompressible fluid at high Reynolds number , 1962, Journal of Fluid Mechanics.

[10]  J. Lumley,et al.  A First Course in Turbulence , 1972 .

[11]  R. Elphic,et al.  The Earth's plasma sheet as a laboratory for flow turbulence in high-β MHD , 1997, Journal of Plasma Physics.

[12]  Y. Gagne,et al.  Velocity probability density functions of high Reynolds number turbulence , 1990 .

[13]  Giuseppe Consolini,et al.  Non‐Gaussian distribution function of AE‐index fluctuations: Evidence for time intermittency , 1998 .

[14]  B. Mandelbrot.  Intermittent turbulence in self-similar cascades: divergence of high moments and dimension of the carrier , 1974, Journal of Fluid Mechanics.

[15]  D. Baker,et al.  Reexamination of driven and unloading aspects of magnetospheric substorms , 1997 .

[16]  B. Anderson,et al.  Current disruptions in the near-Earth neutral sheet region , 1992 .

[17]  N. A. Krall,et al.  Principles of Plasma Physics , 1973 .

[18]  C. Russell,et al.  Multipoint analysis of a bursty bulk flow event on April 11, 1985 , 1996 .

[19]  E. W. Hones,et al.  Multiple-satellite studies of magnetospheric substorms - Distinction between polar magnetic substorms and convection-driven negative bays , 1978 .

[20]  V. A. Sergeev,et al.  Hybrid State of the Tail Magnetic-Configuration During Steady Convection Events , 1994 .

[21]  V. Angelopoulos,et al.  Current sheet measurements within a flapping plasma sheet , 1998 .

[22]  Shiyi Chen,et al.  Sweeping decorrelation in isotropic turbulence , 1989 .

[23]  Hideaki Kawano,et al.  The GEOTAIL Magnetic Field Experiment. , 1994 .

[24]  D. Baker,et al.  The nonlinearity of models of the vB South‐AL coupling , 1996 .

[25]  N. I. Fedorova,et al.  Average patterns of precipitation and plasma flow in the plasma sheet flux tubes during steady magnetospheric convection , 1990 .

[26]  C. Russell,et al.  Characteristics of ion flow in the quiet state of the inner plasma sheet , 1993 .

[27]  E. Bering,et al.  Particle and field signatures during pseudobreakup and major expansion onset , 1994 .

[28]  C. Russell,et al.  Statistical characteristics of bursty bulk flow events , 1994 .

[29]  Vadim M. Uritsky,et al.  Low frequency 1/f-like fluctuations of the AE-index as a possible manifestation of self-organized criticality in the magnetosphere , 1998 .

[30]  B. Castaing.  Conséquences d'un principe d'extremum en turbulence , 1989 .

[31]  C. Russell,et al.  Detection of localized, plasma‐depleted flux tubes or bubbles in the midtail plasma sheet , 1996 .

[32]  Konstantinos Papadopoulos,et al.  Low-dimensional chaos in magnetospheric activity from AE time series , 1990 .

[33]  Lu.  Avalanches in continuum driven dissipative systems. , 1995, Physical review letters.