Coronal heating by fast dissipation of Alfven waves in 3D magnetic fields

被引：0

作者：

Petkaki, P ^{[1
]}

Malara, F ^{[1
]}

Veltri, P ^{[1
]}

机构：

[1] Univ Calabria, Dipartimento Fis, I-87030 Arcavacata, Italy

来源：

CORONA AND SOLAR WIND NEAR MINIMUM ACTIVITY - FIFTH SOHO WORKSHOP | 1997年 / 404卷

关键词：

MHD; plasmas; Sun : corona; Sun : solar wind; waves;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The dissipation of a large number of Alfven wave packets propagating in an inhomogeneous 3-D magnetic field is numerically studied in the WKB approximation. The dissipation rate is found to scale proportional to the logarithm of viscosity and/or resistivity. This phenomenon is related to the exponential separation of neighbouring rays; estimations of the corresponding rate are consistent with the behaviour of the Kolmogorov entropy in this kind of structures. The scaling law t(d) proportional to ln S does hold not only in an irregular magnetic field, but it is verified also in quasi-uniform magnetic structures, which contain very small chaotic regions.

引用

页码：595 / 600

页数：6

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