Whistlerization and anisotropy in two-dimensional electron magnetohydrodynamic turbulence

被引:59
作者
Dastgeer, S [1 ]
Das, A
Kaw, P
Diamond, PH
机构
[1] Inst Plasma Res, Bhat 382428, Gandhinagar, India
[2] Univ Calif San Diego, La Jolla, CA 92093 USA
关键词
D O I
10.1063/1.873843
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
A detailed numerical simulation to understand the turbulent state of the decaying two-dimensional electron magnetohydrodynamics is presented. It is observed that the evolved spectrum is comprised of a collection of random eddies and a gas of whistler waves, the latter constituting the normal oscillatory modes of such a model. The whistlerization of the turbulent spectra has been quantified by novel diagnostics. In this work, results are presented only in the regime where the spatial excitation scales are longer than the electron skin depth. Simulations suggest that spectra at short scales are comparatively more whistlerized. The long scale field merely acts as the ambient field along which whistler waves propagate. It is also observed that, in the presence of an external magnetic field, the power spectrum acquires a distinct directional dependence. This anisotropy is dominant at short scales. It is shown that such an anisotropy at short scales results from a cascade mechanism governed by the interacting whistlers waves. (C) 2000 American Institute of Physics. [S1070-664X(00)04602-4].
引用
收藏
页码:571 / 579
页数:9
相关论文
共 17 条
[1]   ION-CONTROLLED COLLISIONLESS MAGNETIC RECONNECTION [J].
BISKAMP, D ;
SCHWARZ, E ;
DRAKE, JF .
PHYSICAL REVIEW LETTERS, 1995, 75 (21) :3850-3853
[2]   DYNAMICS OF DECAYING TWO-DIMENSIONAL MAGNETOHYDRODYNAMIC TURBULENCE [J].
BISKAMP, D ;
WELTER, H .
PHYSICS OF FLUIDS B-PLASMA PHYSICS, 1989, 1 (10) :1964-1979
[3]   Collisional and collisionless magnetic reconnection [J].
Biskamp, D .
PHYSICS OF PLASMAS, 1997, 4 (05) :1964-1968
[4]   Two-dimensional electron magnetohydrodynamic turbulence [J].
Biskamp, D ;
Schwarz, E ;
Drake, JF .
PHYSICAL REVIEW LETTERS, 1996, 76 (08) :1264-1267
[5]   Electron magnetohydrodynamic turbulence [J].
Biskamp, D ;
Schwarz, E ;
Zeiler, A ;
Celani, A ;
Drake, JF .
PHYSICS OF PLASMAS, 1999, 6 (03) :751-758
[6]   A MODEL FOR THE 3-DIMENSIONAL MAGNETIC-FIELD CORRELATION SPECTRA OF LOW-FREQUENCY SOLAR-WIND FLUCTUATIONS DURING ALFVENIC PERIODS [J].
CARBONE, V ;
MALARA, F ;
VELTRI, P .
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1995, 100 (A2) :1763-1778
[7]   Nonlinear aspects of two-dimensional electron magnetohydrodynamics [J].
Das, A .
PLASMA PHYSICS AND CONTROLLED FUSION, 1999, 41 :A531-A538
[8]  
DAS A, IN PRESS PHYS PLASMA
[9]   STRUCTURE OF THIN CURRENT LAYERS - IMPLICATIONS FOR MAGNETIC RECONNECTION [J].
DRAKE, JF ;
KLEVA, RG ;
MANDT, ME .
PHYSICAL REVIEW LETTERS, 1994, 73 (09) :1251-1254
[10]   Nonlinear mean field electrodynamics of turbulent dynamos [J].
Gruzinov, AV ;
Diamond, PH .
PHYSICS OF PLASMAS, 1996, 3 (05) :1853-1857