Fractal dissipation of small-scale magnetic fluctuations in solar wind turbulence as seen by CLUSTER

被引:3
作者
Kiyani, K. [1 ]
Chapman, S. [1 ]
Khotyaintsev, Y. [2 ]
Dunlop, M. [3 ]
Sahraoui, F. [4 ,5 ]
机构
[1] Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England
[2] Swedish Inst Space Phys, Uppsala, Sweden
[3] Rutherford Appleton Lab, Didcot, Oxon, England
[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[5] Ecole Polytech, CNRS, Lab Phys Plasmas, F-78140 Velizy Villacoublay, France
来源
TWELFTH INTERNATIONAL SOLAR WIND CONFERENCE | 2010年 / 1216卷
基金
英国工程与自然科学研究理事会;
关键词
Turbulence; Collisionless plasma; Space Physics; Solar wind; STAFF EXPERIMENT; ENERGY CASCADE; RANGE; DYNAMICS;
D O I
10.1063/1.3395819
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
A robust multiscale analysis of high-frequency magnetic field measurements from the Cluster spacecraft is presented using complimentary measurements from the magnetometer and search-coil instruments; in a stationary interval of fast ambient solar wind. We show a surprising and novel result: that for time-scales smaller than the ion-gyro period the magnetic field fluctuations exhibit non-Gaussian monoscaling i.e. are globally scale invariant and can be characterized by a single scaling exponent and thus a single universal scaling function for the probability density. This presents new questions, as well as theoretical constraints, for determining how magnetic turbulent energy is dissipated in collisionless plasmas.
引用
收藏
页码:136 / +
页数:2
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