Galactic dynamo and helicity losses through fountain flow

被引：117

作者：

Shukurov, A ^{[1
]}

Sokoloff, D

Subramanian, K

Brandenburg, A

机构：

[1] Univ Newcastle, Sch Math & Stat, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England

[2] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119992, Russia

[3] Interuniv Ctr Astron & Astrophys, Pune 411007, Maharashtra, India

[4] NORDITA, DK-2100 Copenhagen O, Denmark

来源：

ASTRONOMY & ASTROPHYSICS | 2006年 / 448卷 / 02期

关键词：

magnetic fields; turbulence; ISM : magnetic fields; galaxies : ISM;

D O I：

10.1051/0004-6361:200600011

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. Nonlinear behaviour of galactic dynamos is studied, allowing for magnetic helicity removal by the galactic fountain flow. Methods. A suitable advection speed is estimated, and a one-dimensional mean-field dynamo model with dynamic alpha-effect is explored. Results. It is shown that the galactic fountain flow is efficient in removing magnetic helicity from galactic discs. This alleviates the constraint on the galactic mean-field dynamo re resulting from magnetic helicity conservation and thereby allows the mean magnetic field to saturate at strength comparable to equipartition with the turbulent kinetic energy.

引用

页码：L33 / L36

页数：4

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