Intermittency and Local Heating in the Solar Wind

被引：132

作者：

Osman, K. T. ^{[1
,2
]}

Matthaeus, W. H. ^{[2
]}

Wan, M. ^{[2
]}

Rappazzo, A. F. ^{[2
]}

机构：

[1] Univ Warwick, Ctr Fus Space & Astrophys, Coventry CV4 7AL, W Midlands, England

[2] Univ Delaware, Bartol Res Inst, Dept Phys & Astron, Newark, DE 19716 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 26期

基金：

美国国家科学基金会;

关键词：

MHD TURBULENCE; RECONNECTION; PROTON; WAVES;

D O I：

10.1103/PhysRevLett.108.261102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Evidence for nonuniform heating in the solar wind plasma near current sheets dynamically generated by magnetohydrodynamic (MHD) turbulence is obtained using measurements from the ACE spacecraft. These coherent structures only constitute 19% of the data, but contribute 50% of the total plasma internal energy. Intermittent heating manifests as elevations in proton temperature near current sheets, resulting in regional heating and temperature enhancements extending over several hours. The number density of non-Gaussian structures is found to be proportional to the mean proton temperature and solar wind speed. These results suggest magnetofluid turbulence drives intermittent dissipation through a hierarchy of coherent structures, which collectively could be a significant source of coronal and solar wind heating.

引用

页数：4

共 29 条

[1]

Axford WI, 1997, SPACE SCI S, P31

[2] NO EVIDENCE FOR HEATING OF THE SOLAR WIND AT STRONG CURRENT SHEETS [J].

Borovsky, Joseph E. ;

Denton, Michael H. .

ASTROPHYSICAL JOURNAL LETTERS, 2011, 739 (02)

[3]

Burlaga L. F., 1968, SoPh, V4, P67, DOI DOI 10.1007/BF00146999

[4] COHERENT STRUCTURE FORMATION AND MAGNETIC-FIELD LINE RECONNECTION IN MAGNETOHYDRODYNAMIC TURBULENCE [J].

CARBONE, V ;

VELTRI, P ;

MANGENEY, A .

PHYSICS OF FLUIDS A-FLUID DYNAMICS, 1990, 2 (08) :1487-1496

[5] EMPIRICAL CONSTRAINTS ON PROTON AND ELECTRON HEATING IN THE FAST SOLAR WIND [J].

Cranmer, Steven R. ;

Matthaeus, William H. ;

Breech, Benjamin A. ;

Kasper, Justin C. .

ASTROPHYSICAL JOURNAL, 2009, 702 (02) :1604-1614

[6] Why Do Temperature and Velocity Have Different Relationships in the Solar Wind and in Interplanetary Coronal Mass Ejections? [J].

Demoulin, P. .

SOLAR PHYSICS, 2009, 257 (01) :169-184

[7] Waiting-time distributions of magnetic discontinuities: Clustering or Poisson process? [J].

Greco, A. ;

Matthaeus, W. H. ;

Servidio, S. ;

Dmitruk, P. .

PHYSICAL REVIEW E, 2009, 80 (04)

[8] STATISTICAL ANALYSIS OF DISCONTINUITIES IN SOLAR WIND ACE DATA AND COMPARISON WITH INTERMITTENT MHD TURBULENCE [J].

Greco, A. ;

Matthaeus, W. H. ;

Servidio, S. ;

Chuychai, P. ;

Dmitruk, P. .

ASTROPHYSICAL JOURNAL LETTERS, 2009, 691 (02) :L111-L114

[9] THE LOCAL-STRUCTURE OF TURBULENCE IN INCOMPRESSIBLE VISCOUS-FLUID FOR VERY LARGE REYNOLDS-NUMBERS [J].

KOLMOGOROV, AN .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, 1991, 434 (1890) :9-13

[10] A REFINEMENT OF PREVIOUS HYPOTHESES CONCERNING THE LOCAL STRUCTURE OF TURBULENCE IN A VISCOUS INCOMPRESSIBLE FLUID AT HIGH REYNOLDS NUMBER [J].

KOLMOGOROV, AN .

JOURNAL OF FLUID MECHANICS, 1962, 13 (01) :82-85

← 1 2 3 →