NAOC Open IR
MAGNETIC HELICITY REVERSALS IN A CYCLIC CONVECTIVE DYNAMO
Miesch,Mark S.1; Zhang,Mei2; Augustson,Kyle C.3
2016-06-10
Source PublicationThe Astrophysical Journal Letters
ISSN2041-8205
Volume824Issue:1
AbstractABSTRACT We investigate the role of magnetic helicity in promoting cyclic magnetic activity in a global, 3D, magnetohydrodynamic (MHD) simulation of a convective dynamo. This simulation is characterized by coherent bands of toroidal field that exist within the convection zone, with opposite polarities in the northern hemisphere (NH) and southern hemisphere (SH). Throughout most of the cycle, the magnetic helicity in these bands is negative in the NH and positive in the SH. However, during the declining phase of each cycle, this hemispheric rule reverses. We attribute this to a global restructuring of the magnetic topology that is induced by the interaction of the bands across the equator. This band interaction appears to be ultimately responsible for, or at least associated with, the decay and subsequent reversal of both the toroidal bands and the polar fields. We briefly discuss the implications of these results within the context of solar observations, which also show some potential evidence for toroidal band interactions and helicity reversals.
Keyworddynamo magnetohydrodynamics (MHD) stars: activity Sun: activity Sun: interior Sun: magnetic fields
DOI10.3847/2041-8205/824/1/L15
Language英语
WOS IDIOP:2041-8205-824-1-L15
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/36295
Collection中国科学院国家天文台
Affiliation1.High Altitude Observatory, National Center for Atmospheric Research, Boulder, CO 80307-3000, USA; miesch@ucar.edu
2.Key Laboratory of Solar Activity, National Astronomical Observatories, Chinese Academy of Sciences, Datun Road A20, Chaoyang District, Beijing 100012, China
3.CEA/DRF/IRFU Service d’Astrophysique, CEA-Saclay, Batiment 709, F-91191 Gif-sur-Yvette Cedex, France
Recommended Citation
GB/T 7714
Miesch,Mark S.,Zhang,Mei,Augustson,Kyle C.. MAGNETIC HELICITY REVERSALS IN A CYCLIC CONVECTIVE DYNAMO[J]. The Astrophysical Journal Letters,2016,824(1).
APA Miesch,Mark S.,Zhang,Mei,&Augustson,Kyle C..(2016).MAGNETIC HELICITY REVERSALS IN A CYCLIC CONVECTIVE DYNAMO.The Astrophysical Journal Letters,824(1).
MLA Miesch,Mark S.,et al."MAGNETIC HELICITY REVERSALS IN A CYCLIC CONVECTIVE DYNAMO".The Astrophysical Journal Letters 824.1(2016).
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Miesch,Mark S.]'s Articles
[Zhang,Mei]'s Articles
[Augustson,Kyle C.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Miesch,Mark S.]'s Articles
[Zhang,Mei]'s Articles
[Augustson,Kyle C.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Miesch,Mark S.]'s Articles
[Zhang,Mei]'s Articles
[Augustson,Kyle C.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.