TIME-DEPENDENT FORCE-FREE PULSAR
... needed to satisfy the constraints. The two terms have simple meaning: the first is the current perpendicular to fieldlines, given by the advection of charge density with the E × B drift velocity, while the second term is the parallel component of the current which reduces to (∇×B)k in steady state. ...
... needed to satisfy the constraints. The two terms have simple meaning: the first is the current perpendicular to fieldlines, given by the advection of charge density with the E × B drift velocity, while the second term is the parallel component of the current which reduces to (∇×B)k in steady state. ...
MHD seismology as a tool to diagnose the coronae of X
... Detection of fast magnetoacoustic kink waves in ξ-BOO by Pandey & Srivastava (2009): The observations of X-ray oscillations during the flare in a cool active star ξ-Boo is reported for the first time as observed by EPIC/MOS of the XMM-Newton satellite during the epoch on 19 January 2001. The X-ray l ...
... Detection of fast magnetoacoustic kink waves in ξ-BOO by Pandey & Srivastava (2009): The observations of X-ray oscillations during the flare in a cool active star ξ-Boo is reported for the first time as observed by EPIC/MOS of the XMM-Newton satellite during the epoch on 19 January 2001. The X-ray l ...
PPT - JMMC
... Mass accumulation in the dead zone frontier? Time dependent disc accretion rate (eg. self-gravity sets-in, or heating and ionization) ? We are facing a difficulty: need for a self-consistent model taking into account both macro (fluid laminar equations) and microphysics (turbulence + ionization ...
... Mass accumulation in the dead zone frontier? Time dependent disc accretion rate (eg. self-gravity sets-in, or heating and ionization) ? We are facing a difficulty: need for a self-consistent model taking into account both macro (fluid laminar equations) and microphysics (turbulence + ionization ...
PPT
... Important progress has been made both in laboratory experiments and solar and space observations making it possible to collaborate in study of magnetic reconnection/self-orhanization – Transition from collisional to collisionless regime documented – Generalized Sweet Parker model was tested in an ax ...
... Important progress has been made both in laboratory experiments and solar and space observations making it possible to collaborate in study of magnetic reconnection/self-orhanization – Transition from collisional to collisionless regime documented – Generalized Sweet Parker model was tested in an ax ...
PowerPoint - Astronomy at Swarthmore College
... Figure 4 - Phase-folded light curves of 1 Ori C. Open circles represent the excess C IV 1548, 1551 Å equivalent width (left axis) taken from Walborn & Nichols (1994) and phased to the ephemeris of Stahl et al. (1996) with period 15.422 days and MJD0 = 48832.50. Maximum C IV absorption occurs near p ...
... Figure 4 - Phase-folded light curves of 1 Ori C. Open circles represent the excess C IV 1548, 1551 Å equivalent width (left axis) taken from Walborn & Nichols (1994) and phased to the ephemeris of Stahl et al. (1996) with period 15.422 days and MJD0 = 48832.50. Maximum C IV absorption occurs near p ...
20041012090010101-148840
... generates thin ’jet’ with vortex pairs moves very slowly, in ~ pressure equilibrium essentially a wrinkled 2D contact discontinuity ...
... generates thin ’jet’ with vortex pairs moves very slowly, in ~ pressure equilibrium essentially a wrinkled 2D contact discontinuity ...
scholer-shocks
... The sound speed is greater at the peak of the compressional wave where the density is higher than in front or behind of the peak. The peak will catch up with the part of the peak ahead of it, and the wave steepens. The wave steepens until the flow becomes nonadiabatic. Viscous effects become importa ...
... The sound speed is greater at the peak of the compressional wave where the density is higher than in front or behind of the peak. The peak will catch up with the part of the peak ahead of it, and the wave steepens. The wave steepens until the flow becomes nonadiabatic. Viscous effects become importa ...
Exercise 4
... 4. First let us exercise parallel runs interactively. (You are only allowed to run for one CPU hour in any interactive session, with 15 minutes per process, but that will suffice for a quick test. If it is not enough, follow the directions below for setting up a batch job.) Set up a 642 blast wav ...
... 4. First let us exercise parallel runs interactively. (You are only allowed to run for one CPU hour in any interactive session, with 15 minutes per process, but that will suffice for a quick test. If it is not enough, follow the directions below for setting up a batch job.) Set up a 642 blast wav ...
Poster
... with solving the accretion disk self-consistently. The accretion disk is perturbed with a sinusoidal or random fluctuation of the rotational velocity to investigate the stability of the MHD jet ejected from the disk in 3-dimention. The jet has a non-axisymmetric (m=2 like) structure in the both pert ...
... with solving the accretion disk self-consistently. The accretion disk is perturbed with a sinusoidal or random fluctuation of the rotational velocity to investigate the stability of the MHD jet ejected from the disk in 3-dimention. The jet has a non-axisymmetric (m=2 like) structure in the both pert ...
Document
... The acceleration and collimation mechanisms of astrophysical jets are still not made clear and various models have been proposed. One of the most promising models is magnetohydorodynamic (MHD) acceleration from accretion disks. We develop the CIP-MOCCT scheme to three-dimensional cylindrical code an ...
... The acceleration and collimation mechanisms of astrophysical jets are still not made clear and various models have been proposed. One of the most promising models is magnetohydorodynamic (MHD) acceleration from accretion disks. We develop the CIP-MOCCT scheme to three-dimensional cylindrical code an ...
On Magnetohydrodynamic (MHD)
... Water base nanofluids containing Copper (Cu) and Alumina (Al2O3) are used. The governing nonlinear differential equations are obtained and solved numerically using the 4th order Runge-Kutta method with shooting technique taking into consideration the complex interaction between the electrical co ...
... Water base nanofluids containing Copper (Cu) and Alumina (Al2O3) are used. The governing nonlinear differential equations are obtained and solved numerically using the 4th order Runge-Kutta method with shooting technique taking into consideration the complex interaction between the electrical co ...
The Virial Theorem, MHD Equilibria, and Force
... These lecture notes are largely based on Plasma Physics for Astrophysics by Russell Kulsrud, Lectures in Magnetohydrodynamics by the late Dalton Schnack, Ideal Magnetohydrodynamics by Jeffrey Freidberg, Hydrodynamic and Hydromagnetic Stability by S. Chandrasekhar, Classical Electrodynamics by J. Jac ...
... These lecture notes are largely based on Plasma Physics for Astrophysics by Russell Kulsrud, Lectures in Magnetohydrodynamics by the late Dalton Schnack, Ideal Magnetohydrodynamics by Jeffrey Freidberg, Hydrodynamic and Hydromagnetic Stability by S. Chandrasekhar, Classical Electrodynamics by J. Jac ...
4 - Princeton CS
... Ever larger simulations, e.g. 1011 particles allows one to follow every star in a galaxy. ...
... Ever larger simulations, e.g. 1011 particles allows one to follow every star in a galaxy. ...
What is ZEUS-3D? - Institute for Computational Astrophysics
... this completely cures the magnetic explosion instability in super-Alfvénic turbulence. The issue is this. In order to estimate the 3-component of the induced electric field (E3 = v1 B2 − v2 B1 located at the 3-edge), upwinded 1-interpolations of v2 and B2 and upwinded 2-interpolations of v1 and B1 ...
... this completely cures the magnetic explosion instability in super-Alfvénic turbulence. The issue is this. In order to estimate the 3-component of the induced electric field (E3 = v1 B2 − v2 B1 located at the 3-edge), upwinded 1-interpolations of v2 and B2 and upwinded 2-interpolations of v1 and B1 ...
Beyond Ideal MHD - Harvard-Smithsonian Center for Astrophysics
... astrophysicists care about them at all? ...
... astrophysicists care about them at all? ...
IOSR Journal of Mathematics (IOSR-JM)
... discussed flow through horizontal channels of porous material and obtained velocity expressions in terms of the Reynolds number. Ganesh (2007) studied unsteady MHD Stokes flow of a viscous fluid between two parallel porous plates. Gbadeyan, Idowu et al (2010) studied the radiative effect on velocity ...
... discussed flow through horizontal channels of porous material and obtained velocity expressions in terms of the Reynolds number. Ganesh (2007) studied unsteady MHD Stokes flow of a viscous fluid between two parallel porous plates. Gbadeyan, Idowu et al (2010) studied the radiative effect on velocity ...
Simulations and radiative diagnostics of turbulence and waves in
... • 12x12x1.4 Mm domain resolved by ...
... • 12x12x1.4 Mm domain resolved by ...
Self-Similar Energy Decay in Magnetohydrodynamic Turbulence
... assumption well fulfilled at high hyperviscosity with however a ,st 2 tp d20.77 decay law, a decay almost coincident with that reported in [21] under the same conditions of constancy of kA2 l. The lack of dependence in (6) on the global velocitymagnetic field correlation coefficient rC is not necess ...
... assumption well fulfilled at high hyperviscosity with however a ,st 2 tp d20.77 decay law, a decay almost coincident with that reported in [21] under the same conditions of constancy of kA2 l. The lack of dependence in (6) on the global velocitymagnetic field correlation coefficient rC is not necess ...
Conservation Laws in Ideal MHD - Harvard
... In toroidal laboratory experiments, it is natural to consider the volume contained within conducting wall boundaries that are coincident with closed flux surfaces (i.e., the magnetic field along the wall is parallel to the boundary) ...
... In toroidal laboratory experiments, it is natural to consider the volume contained within conducting wall boundaries that are coincident with closed flux surfaces (i.e., the magnetic field along the wall is parallel to the boundary) ...
Section_32_Magnetic_..
... We now begin discussions of the dynamics of the magneto-fluid system when resistivity is included in the model. This is called resistive MHD. There are several important differences from ideal MHD. First, the ideal Ohm’s law is no longer valid, so all the things we have been talking about regarding ...
... We now begin discussions of the dynamics of the magneto-fluid system when resistivity is included in the model. This is called resistive MHD. There are several important differences from ideal MHD. First, the ideal Ohm’s law is no longer valid, so all the things we have been talking about regarding ...
New results on the age- activity relation from Kepler Alfio Bonanno
... • The amplitude of the oscillations are suppressed with the total magnetic energy released in the atmosphere • Further data needed to extend these scaling relations to other stars, but direct numerical simulations can now be tested along the HR diagram ...
... • The amplitude of the oscillations are suppressed with the total magnetic energy released in the atmosphere • Further data needed to extend these scaling relations to other stars, but direct numerical simulations can now be tested along the HR diagram ...
Magnetohydrodynamic generator
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A magnetohydrodynamic generator (MHD generator) is a magnetohydrodynamic device that transforms thermal energy and kinetic energy into electricity. MHD generators are different from traditional electric generators in that they operate at high temperatures without moving parts. MHD was developed because the hot exhaust gas of an MHD generator can heat the boilers of a steam power plant, increasing overall efficiency. MHD was developed as a topping cycle to increase the efficiency of electric generation, especially when burning coal or natural gas. MHD dynamos are the complement of MHD propulsors, which have been applied to pump liquid metals and in several experimental ship engines.An MHD generator, like a conventional generator, relies on moving a conductor through a magnetic field to generate electric current. The MHD generator uses hot conductive plasma as the moving conductor. The mechanical dynamo, in contrast, uses the motion of mechanical devices to accomplish this. MHD generators are technically practical for fossil fuels, but have been overtaken by other, less expensive technologies, such as combined cycles in which a gas turbine's or molten carbonate fuel cell's exhaust heats steam to power a steam turbine.Natural MHD dynamos are an active area of research in plasma physics and are of great interest to the geophysics and astrophysics communities, since the magnetic fields of the earth and sun are produced by these natural dynamos.