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Dipole Collapse and Dynamo Waves in Global Direct Numerical Simulations
Dipole Collapse Dynamo Waves Global Direct Numerical Simulations
2012/2/23
Magnetic fields of low-mass stars and planets are thought to originate from self-excited dynamo action in their convective interiors. Observations reveal a variety of field topologies ranging from lar...
Helicity and dynamo action in magnetized stellar radiation zones
magnetohydrodynamics (MHD) – instabilities – stars: magnetic fi elds – stars: interiors
2011/10/8
Helicity and \alpha effect driven by the nonaxisymmetric Tayler instability of toroidal magnetic fields in stellar radiation zones are computed. In the linear approximation a purely toroidal field alw...
Scaling and intermittency in incoherent α-shear dynamo
Dynamo – magnetic fi elds – MHD – turbulence
2011/10/8
We consider mean-field dynamo models with fluctuating \alpha effect, both with and without shear. The \alpha effect is chosen to be Gaussian white noise with zero mean and given covariance. We show an...
Using the magnetohydrodynamic (MHD) description, we develop a nonlinear dynamo model that couples the evolution of the large scale magnetic field with turbulent dynamics of the plasma at small scale b...
Main-sequence massive stars possess convective cores that likely harbor strong dy-namo action. To assess the role of core convection in building magnetic fields within these stars, we employ the 3-D a...
Global dynamo simulations solving the equations of magnetohydrodynamics (MHD) have been a tool of astrophysicists who try to understand the magnetism of the Sun for several decades now. During recent ...
Dynamo generated field emergence through recurrent plasmoid ejections
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/23
Magnetic buoyancy is believed to drive the transport of magnetic flux tubes from the convection zone to the surface of the Sun. The magnetic fields form twisted loop-like structures in the solar atmos...
Helicity of Solar Active Regions from a Dynamo Model
MHD—Sun activity—Sun magnetic fields—sunspots
2010/9/16
We calculate helicities of solar active regions based on the idea that poloidal flux lines get wrapped around a toroidal flux tube rising through the convection zone, thereby giving rise to the helici...
Some Recent Developments in Solar Dynamo Theory
Sun magnetic field sunspots solar cycle MHD
2010/9/16
We discuss the current status of solar dynamo theory and describe the dynamo model developed by our group. The toroidal magnetic field is generated in the tachocline by the strong differential rotatio...
Global Solar Dynamo Models: Simulations and Predictions
Sun magnetic fields solar cycle dynamo predictio
2010/9/15
Flux-transport type solar dynamos have achieved considerable success in correctly simulating many solar cycle features, and are nowbeing used for prediction of solar cycle timing and amplitude.We firs...
Explained: Dynamo theory--Recent discoveries raise questions about how small planets can have self-sustaining magnetic fields（图）
Dynamo theory small planets self-sustaining magnetic fields
2010/4/21
The Earth’s global magnetic field is generated in its metallic core, located nearly 3,000 kilometers beneath the planet’s surface. The field has existed on Earth for at least 3.5 billion years and off...
Some Recent Developments in Solar Dynamo Theory
Sun:magnetic field-sunspots-solar cycle-MHD
2009/5/7
We discuss the current status of solar dynamo theory and describe the dynamo model developed by our group. The toroidal magnetic field is generated in the tachocline by the strong differential rotatio...
Helicity of Solar Active Regions from a Dynamo Model
MHD Sun:activity Sun:magnetic fields sunspots
2009/5/7
We calculate helicities of solar active regions based on the idea that poloidal flux lines get wrapped around a toroidal flux tube rising through the convection zone, thereby giving rise to the helici...
Global Solar Dynamo Models：Simulations and Predictions
Sun magnetic fields: solar cycle dynamo prediction
2009/5/5
Flux-transport type solar dynamos have achieved considerable
success in correctly simulating many solar cycle features, and are nowbeing
used for prediction of solar cycle timing and amplitude.We fi...
LARGE-SCALE DYNAMO OF ACCRETION DISKS AROUND SUPERMASSIVE NONROTATING BLACK HOLES
Galaxies active-Accretion, accretion disks-MHD-Magnetic fields
2009/2/18
LARGE-SCALE DYNAMO OF ACCRETION DISKS AROUND SUPERMASSIVE NONROTATING BLACK HOLES。