STATISTICAL ANALYSIS OF THE MAGNETIC HELICITY SIGNATURE OF THE SOLAR WIND TURBULENCE AT 1 AU

被引：21

作者：

Markovskii, S. A. ^{[1
]}

Vasquez, Bernard J. ^{[1
]}

Smith, Charles W. ^{[1
]}

机构：

[1] Univ New Hampshire, Ctr Space Sci, Durham, NH 03824 USA

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 806卷 / 01期

基金：

美国国家科学基金会;

关键词：

plasmas; solar wind; turbulence; OBSERVATIONAL CONSTRAINTS; DISSIPATION RANGE; FIELD TURBULENCE; ANISOTROPY; CASCADE; CYCLOTRON; WAVES; FLUCTUATIONS; SPECTRA; EVOLUTION;

D O I：

10.1088/0004-637X/806/1/78

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The absolute value of the magnetic helicity spectrum of the solar wind turbulence often has a peak at kinetic scales. This helicity signature is important for understanding the mechanism of the turbulent cascade. In this paper, a statistical analysis of the magnetic helicity is performed. For this purpose, a database of the solar wind intervals with the helicity signature was assembled using Wind spacecraft magnetic and plasma data. New statistically significant correlations between the magnetic helicity and the properties of the background plasma are found. The position of the signature within the spectrum depends on the proton gyroscale and the proton inertial scale. Possible mechanisms responsible for the observed trends are discussed. The helicity peak is interpreted as a result of two competing processes, one of which generates the helicity and the other one eliminates it.

引用

页数：6

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