Double peak structure and diamagnetic wings of the magnetotail current sheet

被引:10
|
作者
Zimbardo, G
Greco, A
Veltri, P
Taktakishvili, AL
Zelenyi, LM
机构
[1] Univ Calabria, Dept Phys, I-87036 Arcavacata Di Rende, Italy
[2] Abastumani Astrophys Observ, GE-380060 Tbilisi, Georgia
[3] Moscow Space Res Inst, Moscow 117810, Russia
[4] Ist Nazl Fis Mat, Unita Cosenza, Cosenza, Italy
关键词
magnetospheric physics; magnetotail; plasma sheet; space plasma physics; numerical simulation studies;
D O I
10.5194/angeo-22-2541-2004
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Recent Cluster observations in the magnetotail at about 20 Earth radii downtail have unambiguously shown that sometimes the current sheet is bifurcated, i.e. it is divided in two layers. We report numerical simulations of the ion dynamics in a quasi-neutral sheet in the presence of magnetic turbulence, which is often observed in the magnetotail, and for various anisotropies of the ion distribution function. Ions are injected at the boundary of the simulation box with a velocity distribution corresponding to a shifted Maxwellian. The simulation parameters, are adjusted to be similar to those of Cluster observations. We find that even for moderate fluctuation levels, the computed current density profile develops a double peak, in agreement with the observations. By varying the anisotropy of the injected distribution function, we are able to reproduce, for weak anisotropy, the magnetic field overshoots which are sometimes observed prior to magnetotail traversals. Therefore, we suggest an ion current profile with a double peak due to magnetic turbulence, and with possible diamagnetic current wings, present in the case of weak anisotropy of the ion distribution function.
引用
收藏
页码:2541 / 2546
页数:6
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