搜索结果: 1-15 共查到“天文学 transport”相关记录15条 . 查询时间(0.203 秒)
We show that simple 2 and 3-layer flux-transport dynamos, when forced at the top by a poloidal source term, can produce a widely varying amplitude of toroidal field at the bottom, depending on how clo...
Cross-helicity effects and turbulent transport in magnetohydrodynamic flow
Cross-helicity effects turbulent transport magnetohydrodynamic
2011/9/28
In the presence of large-scale vortical motions and/or magnetic-field strains, the turbulent cross helicity (velocity--magnetic-field correlation in fluctuations) may contribute to the turbulent elect...
Semi-analytical model of cosmic ray electron transport
Semi-analytical model cosmic ray electron transport
2011/9/28
We present a numerical extension to the analytical propagation model introduced in Hein and Spanier (2008) to describe the leptonic population in the galactic disc. The model is used to derive a possi...
Modeling of the subgrid-scale term of the filtered magnetic field transport equation
the subgrid-scale term the filtered magnetic field
2011/1/11
Accurate subgrid-scale turbulence models are needed to perform realistic numerical magnetohydrodynamic (MHD) simulations of the subsurface flows of the Sun. To perform large-eddy simulations (LES) of ...
Magnetic helicity transport in the advective gauge family
Magnetic helicity transport the advective gauge family
2011/1/13
Magnetic helicity fluxes are investigated in a family of gauges in which the contribution from ideal magnetohydrodynamics takes the form of a purely advective flux. Numerical simulations of magnetohyd...
The Potential Importance of Non-Local, Deep Transport on the Energetics, Momentum, Chemistry, and Aerosol Distributions in the Atmospheres of Earth, Mars and Titan
Non-Local Deep Transport the Energetics
2011/1/11
A review of non-local, deep transport mechanisms in the atmosphere of Earth provides a good foundation for examining whether similar mechanisms are operating in the atmospheres of Mars and Titan. On E...
p, He, and C to Fe cosmic-ray primary fluxes in diffusion models: Source and transport signatures on fluxes and ratios
Methods statistical – ISM cosmic rays
2010/11/10
Context. The source spectrum of cosmic rays is not well determined by diffusive shock acceleration models. The prop-agated fluxes of proton, helium, and heavier primary cosmic-ray species (up to Fe) a...
3D numerical MHD modeling of sunspots with radiation transport
MHD – radiative transfer – Sun sunspots – Sun photosphere – Sun magnetic
2010/11/10
Sunspot fine structure has been modeled in the past by a combination of idealized magneto-convection simulations and simplified models that prescribe the magnetic field and flow structure to a large d...
Numerically determined transport laws for fingering ("thermohaline") convection in astrophysics
hydrodynamics instabilities turbulence
2010/11/16
We present the first three-dimensional simulations of fingering convection performed in a parameter regime close to the one relevant for astrophysics, and reveal the existence of simple asymptotic sca...
A High-Order WENO-based Staggered Godunov-type Scheme with Constrained Transport for Force-free Electrodynamics
High Energy Astrophysical Phenomena (astro-ph.HE)
2011/1/7
The force-free (or low inertia) limit of magnetohydrodynamics (MHD) can be applied to many astrophysical objects, including black holes, neutron stars, and accretion disks, where the electromagnetic f...
Transport of First Rocks of The Solar System by X-winds
Earth and Planetary Astrophysics (astro-ph.EP) Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/29
It has been suggested that chondrules and calcium-aluminum-rich inclusions (CAIs) were formed at the inner edge of the protoplanetary disk and then entrained in magnetocentrifugal X-winds. We study tr...
Variations in the axisymmetric transport of magnetic elements on the Sun: 1996-2010
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/27
We measure the axisymmetric transport of magnetic flux on the Sun by cross-correlating narrow strips of data from line-of-sight magnetograms obtained at a 96-minute cadence by the MDI instrument on th...
A heliospheric hybrid model：hydrodynamic plasma flow and kinetic cosmic ray transport
heliospheric hybrid hydrodynamic plasma flow kinetic cosmic ray transport
2009/5/27
In this paper we present a new five particle species hybrid model for calculating cosmic ray particle transport and acceleration in a dynamic heliospheric environment. In particular the effects of sol...
Observations of anomalous transport of energetic electrons in the heliosphere
energetic electrons anomalous transport heliosphere
2009/5/27
We study the propagation of energetic particles, accelerated by interplanetary shock waves, upstream of the shock, considering the possibility of having anomalous transport. The theoretical treatment ...
Angular Momentum Transport in Quasi-Keplerian Accretion Disks
Accretion viscosity disks angular momentum
2009/5/19
We reexamine arguments advanced by Hayashi & Matsuda
(2001), who claim that several simple, physically motivated derivations
based on mean free path theory for calculating the viscous torque in a
q...