Density Fluctuation Spectrum of Solar Wind Turbulence between Ion and Electron Scales

被引：96

作者：

Chen, C. H. K. ^{[1
]}

Salem, C. S. ^{[1
]}

Bonnell, J. W. ^{[1
]}

Mozer, F. S. ^{[1
]}

Bale, S. D. ^{[1
,2
]}

机构：

[1] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 03期

关键词：

ALFVEN-WAVE TURBULENCE; MAGNETOHYDRODYNAMIC TURBULENCE; MAGNETIC FLUCTUATIONS; POWER SPECTRA; OBSERVATIONAL CONSTRAINTS; HALL MAGNETOHYDRODYNAMICS; HELIOS-OBSERVATIONS; DISSIPATION RANGE; ENERGY CASCADE; PLASMA;

D O I：

10.1103/PhysRevLett.109.035001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present a measurement of the spectral index of density fluctuations between ion and electron scales in solar wind turbulence using the EFI instrument on the ARTEMIS spacecraft. The mean spectral index at 1 AU was found to be -2.75 +/- 0.06, steeper than predictions for pure whistler or kinetic Alfven wave turbulence but consistent with previous magnetic field measurements. The steep spectra are also consistent with expectations of increased intermittency or damping of some of the turbulent energy over this range of scales. Neither the spectral index nor the flattening of the density spectra before ion scales were found to depend on the proximity to the pressure anisotropy instability thresholds, suggesting that they are features inherent to the turbulent cascade.

引用

页数：6

共 78 条

[1] Small-scale energy cascade of the solar wind turbulence [J].

Alexandrova, O. ;

Carbone, V. ;

Veltri, P. ;

Sorriso-Valvo, L. .

ASTROPHYSICAL JOURNAL, 2008, 674 (02) :1153-1157

[2] Universality of Solar-Wind Turbulent Spectrum from MHD to Electron Scales [J].

Alexandrova, O. ;

Saur, J. ;

Lacombe, C. ;

Mangeney, A. ;

Mitchell, J. ;

Schwartz, S. J. ;

Robert, P. .

PHYSICAL REVIEW LETTERS, 2009, 103 (16)

[3] The ARTEMIS Mission [J].

Angelopoulos, V. .

SPACE SCIENCE REVIEWS, 2011, 165 (1-4) :3-25

[4]

[Anonymous], 1964, Soviet Astronomy

[5] The THEMIS Fluxgate Magnetometer [J].

Auster, H. U. ;

Glassmeier, K. H. ;

Magnes, W. ;

Aydogar, O. ;

Baumjohann, W. ;

Constantinescu, D. ;

Fischer, D. ;

Fornacon, K. H. ;

Georgescu, E. ;

Harvey, P. ;

Hillenmaier, O. ;

Kroth, R. ;

Ludlam, M. ;

Narita, Y. ;

Nakamura, R. ;

Okrafka, K. ;

Plaschke, F. ;

Richter, I. ;

Schwarzl, H. ;

Stoll, B. ;

Valavanoglou, A. ;

Wiedemann, M. .

SPACE SCIENCE REVIEWS, 2008, 141 (1-4) :235-264

[6] Magnetic Fluctuation Power Near Proton Temperature Anisotropy Instability Thresholds in the Solar Wind [J].

Bale, S. D. ;

Kasper, J. C. ;

Howes, G. G. ;

Quataert, E. ;

Salem, C. ;

Sundkvist, D. .

PHYSICAL REVIEW LETTERS, 2009, 103 (21)

[7] Measurement of the electric fluctuation spectrum of magnetohydrodynamic turbulence [J].

Bale, SD ;

Kellogg, PJ ;

Mozer, FS ;

Horbury, TS ;

Reme, H .

PHYSICAL REVIEW LETTERS, 2005, 94 (21)

[8] HELIOCENTRIC DISTANCE DEPENDENCE OF INTER-PLANETARY MAGNETIC-FIELD [J].

BEHANNON, KW .

REVIEWS OF GEOPHYSICS, 1978, 16 (01) :125-145

[9] PROPERTIES OF WHISTLER MODE WAVES BETWEEN 0.3 AND 1.0 AU FROM HELIOS OBSERVATIONS [J].

BEINROTH, HJ ;

NEUBAUER, FM .

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 1981, 86 (NA9) :7755-7760

[10] Two-dimensional electron magnetohydrodynamic turbulence [J].

Biskamp, D ;

Schwarz, E ;

Drake, JF .

PHYSICAL REVIEW LETTERS, 1996, 76 (08) :1264-1267

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