Dynamo efficiency in compressible convective dynamos with and without penetration
Dynamo efficiency in compressible convective dynamos with and without penetration
复制标题
有和没有穿透的可压缩对流发电机的发电机效率
DOI:
10.1080/03091929.2010.495067
复制
发表时间:
2010
影响因子:
1.3
通讯作者:
Brummell N
中科院分区:
文献类型:
--
作者:
Brummell N
We investigate dynamo action in compressible convection via numerical simulations in a Cartesian domain. We directly compare the dynamo properties of a fully convective domain with the same domain extended to include an underlying stable region. These simulations extend models of fully convective domains with open lower boundary conditions to a more self-consistent model. We examine whether the extremely slow recirculation of the lower region affects the dynamo properties in the convection zone. We find that the dynamo properties of the upper convective region are essentially unchanged by the addition of the lower stable region. After a transient period, dynamo action in the convective region not only proceeds as normal, but also extends into the region of overshooting flow in the stable region. Downward magnetic pumping, long recirculation times and the low percentage of rising elements that transit the vertical extent of the domain all fail to eliminate the dynamo. Sufficient magnetic field is recirculated or remains in the convective region to fuel the local dynamo there. The independence of the convective layer from the conditions of the lower layer makes the dynamo truly local.
登录
查看更多内容
DOI:
10.1086/175800
发表时间:
1995-06
期刊:
The Astrophysical Journal
影响因子:
--
作者:
Haosheng Lin
通讯作者:
Haosheng Lin
DOI:
--
发表时间:
2001
期刊:
影响因子:
--
作者:
T. Emonet;F. Cattaneo
通讯作者:
F. Cattaneo
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
R. Stein;Å. Nordlund
通讯作者:
Å. Nordlund
DOI:
--
发表时间:
1984
期刊:
影响因子:
--
作者:
N. Hurlburt;J. Toomre;J. Massaguer
通讯作者:
J. Massaguer