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
收藏
页码：595 / 600
页数：6
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