Magnetic turbulence and ion dynamics in the magnetotail

被引：2
|
作者：
Taktakishvili, AL [1 ]
Greco, A
Veltri, P
Zimbardo, G
Zelenyi, LM
Milovanov, AV
机构：
[1] Abastumani Astrophys Observ, Tbilisi, Georgia
[2] Univ Calabria, Dept Phys, I-87036 Arcavacata di Rende, Italy
[3] Ist Nazl Fis Mat, Unita Cosenza, I-87036 Arcavacata di Rende, Italy
[4] Space Res Inst, Moscow, Russia
来源：
ASTROPHYSICS AND SPACE SCIENCE | 2001年 / 277卷 / 1-2期
关键词：
D O I：
10.1023/A:1012276808208
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The ion dynamics in the Earth's magnetotail is studied in the case when a cross tail electric field E-o and reconnection-driven magnetic turbulence are present in the current sheet. The magnetic turbulence observed by the Interball spacecraft is modeled numerically by a power law magnetic fluctuation spectrum. A test particle simulation is performed for the ions, and the distribution function moments are obtained as a function of the magnetic fluctuation level, deltaB/B-o, and of the value of the normal component B-n. It appears that even in the presence of magnetic turbulence, the normal component has a marked influence on particle dynamics: the ion bulk velocity along E-y and ion temperature are almost inversely proportional to B-n. The magnetic turbulence causes the current to split in two layers, and the level of magnetic fluctuations needed to have splitting is roughly proportional to B-n. It appears that in the relevant range of parameters, B-n and deltaB/B-o have opposite effects on the current structure and on ion heating.
引用
收藏
页码：71 / 79
页数：9
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