Direct simulations of helical Hall-MHD turbulence and dynamo action

被引：53

作者：

Mininni, PD

Gómez, DO

Mahajan, SM

机构：

[1] Natl Ctr Atmospher Res, Adv Study Program, Boulder, CO 80307 USA

[2] Univ Buenos Aires, Fac Ciencias Exactas & Nat, Dept Fis, RA-1428 Buenos Aires, DF, Argentina

[3] Univ Texas, Inst Fus Studies, Austin, TX 78712 USA

[4] Inst Astron & Fis Espacio, RA-1428 Buenos Aires, DF, Argentina

来源：

ASTROPHYSICAL JOURNAL | 2005年 / 619卷 / 02期

关键词：

accretion; accretion disks; magnetic fields; MHD; stars : magnetic fields; stars : neutron;

D O I：

10.1086/426534

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Direct numerical simulations of turbulent Hall dynamos are presented. The evolution of an initially weak and small-scale magnetic field in a system maintained in a stationary turbulent regime by a stirring force at a macroscopic scale is studied to explore the conditions for exponential growth of the magnetic energy. Scaling of the dynamo efficiency with Reynolds numbers is studied, and the resulting total energy spectra are found to be compatible with a Kolmogorov-type law. A faster growth of large-scale magnetic fields is observed at intermediate intensities of the Hall effect.

引用

页码：1019 / 1027

页数：9

共 32 条

[1] Linear analysis of the Hall effect in protostellar disks [J].