Density spectrum in the diffuse interstellar medium and solar wind

被引：14

作者：

Dastgeer, S ^{[1
]}

Zank, GP ^{[1
]}

机构：

[1] Univ Calif Riverside, Inst Geophys & Planetary Phys, Riverside, CA 92521 USA

来源：

ASTROPHYSICAL JOURNAL | 2004年 / 602卷 / 01期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

ISM : general; methods : numerical; plasmas; solar wind; turbulence;

D O I：

10.1086/382275

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Inertial range turbulence properties are investigated for nearly incompressible density fluctuations using two-dimensional nonlinear fluid simulations. We find that density fluctuations behave as a passive scalar and do not satisfy the pseudosound approximation. As a result, the density fluctuations follow a Kolmogorov-like spectrum, and this is a possible explanation for the observed diffuse interstellar and solar wind density fluctuation spectrum.

引用

页码：L29 / L32

页数：4

共 21 条

[1] OBSERVATIONS OF FIELD-ALIGNED DENSITY-FLUCTUATIONS IN THE INNER SOLAR-WIND [J].

ARMSTRONG, JW ;

COLES, WA ;

KOJIMA, M ;

RICKETT, BJ .

ASTROPHYSICAL JOURNAL, 1990, 358 (02) :685-692

[2] DENSITY POWER SPECTRUM IN THE LOCAL INTER-STELLAR MEDIUM [J].

ARMSTRONG, JW ;

CORDES, JM ;

RICKETT, BJ .

NATURE, 1981, 291 (5816) :561-564

[3] DENSITY VARIATIONS IN WEAKLY COMPRESSIBLE FLOWS [J].

BAYLY, BJ ;

LEVERMORE, CD ;

PASSOT, T .

PHYSICS OF FLUIDS A-FLUID DYNAMICS, 1992, 4 (05) :945-954

[4] Compressible sub-Alfvenic MHD turbulence in low-β plasmas -: art. no. 245001 [J].

Cho, JY ;

Lazarian, A .

PHYSICAL REVIEW LETTERS, 2002, 88 (24) :4

[5] The anisotropy of magnetohydrodynamic Alfvenic turbulence [J].

Cho, JY ;

Vishniac, ET .

ASTROPHYSICAL JOURNAL, 2000, 539 (01) :273-282

[6]

DASTGEER S, 2004, UNPUB APJL

[7] TOWARD A THEORY OF INTERSTELLAR TURBULENCE .2. STRONG ALFVENIC TURBULENCE [J].

GOLDREICH, P ;

SRIDHAR, S .

ASTROPHYSICAL JOURNAL, 1995, 438 (02) :763-775

[8]

Lesieur M., 1990, TURBULENCE FLUIDS

[9] ON SOUND GENERATED AERODYNAMICALLY .1. GENERAL THEORY [J].

LIGHTHILL, MJ .

PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1952, 211 (1107) :564-587

[10] Compressible magnetohydrodynamic turbulence in interstellar plasmas [J].

Lithwick, Y ;

Goldreich, P .

ASTROPHYSICAL JOURNAL, 2001, 562 (01) :279-296

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