21,597 research outputs found
Ising Dipoles on the Triangular Lattice
A cluster Monte Carlo method for systems of classical spins with purely
dipolar couplings is presented. It is tested and applied for finite arrays of
perpendicular Ising dipoles on the triangular lattice. This model is a
modification with long-range interactions of the geometrically frustrated Ising
antiferromagnet. From measurements of integrated autocorrelation times for
energy, magnetization and staggered magnetizations, a high efficiency of the
cluster Monte Carlo (MC) algorithm compared to a single-spin-flip algorithm is
found. For the investigated model, a finite temperature transition is found
which is characterized by a peak in the specific heat and in the staggered
susceptibilities.Comment: 4 pages, 3 figures. Presented at the 8th Joint MMM-Intermag
Conference, San Antonio 2001. To appear in J.Appl.Physic
Generation of a North/South Magnetic Field Component from Variations in the Photospheric Magnetic Field
We address the problem of calculating the transverse magnetic field in the
solar wind outside of the hypothetical sphere called the source surface where
the solar wind originates. This calculation must overcome a widely used
fundamental assumption about the source surface -- the field is normally
required to purely radial at the source surface. Our model rests on the fact
that a change in the radial field strength at the source surface is a change in
the field line density. Surrounding field lines must move laterally in order to
accommodate this field line density change. As the outward wind velocity drags
field lines past the source surface this lateral component of motion produces a
tilt implying there is a transverse component to the field.
An analytic method of calculating the lateral translation speed of the field
lines is developed. We apply the technique to an interval of approximately two
Carrington rotations at the beginning of 2011 using 2-h averages of data from
the Helioseismic Magnetic Imager instrument on the Solar Dynamics Observatory
spacecraft. We find that the value of the transverse magnetic field is
dominated on a global scale by the effects of high latitude concentrations of
field lines being buffetted by supergranular motions.Comment: 23 pages with 8 figures. Accepted by Solar Physics (LaTeX processing
with aastex6.cls instead of solarphysics.cls due to compatibility issues
Physical Origin of Differences among various Measures of Solar Meridional Circulation
We show that systematic differences between surface Doppler and magnetic
element tracking measures of solar meridional flow can be explained by the
effects of surface turbulent magnetic diffusion. Feature-tracking speeds are
lower than plasma speeds in low and mid-latitudes, because magnetic diffusion
opposes poleward plasma flow in low-latitudes whereas it adds to plasma flow at
high latitudes. Flux transport dynamo models must input plasma flow; the
model-outputs yield estimates of the surface magnetic feature tracking speed.
We demonstrate that the differences between plasma speed and magnetic pattern
speed in a flux-transport dynamo are consistent with the observed difference
between these speeds.Comment: To appear in Ap
The Problem of Legitimacy in the European Polity. Is Democratization the Answer?
The authors discuss potential sources of legitimacy of the EU, i. e. of the normative bindingness of its decisions. After rejecting the views that such legitimacy is either not needed, not feasible, or provided for already, they focus upon the corrosive impact of the EU upon democratic legitimacy within member states. Brussels-based 'governance' is essentially uncontested and can hardly provide for the legitimacy that results from the interplay between government and opposition within nation states. The problem boils down to achieving legitimacy in the absence of the political community of a 'demos'. The paper outlines a solution to this problem that relies on the apparently oxymoronic model of a 'republican empire' - a political community, that is, which is held together not by the bonds of some presumed sameness, but, to the contrary, by the shared contractual recognition of the dissimilarity of its constituent parts from which legitimacy can flow.democracy; legitimacy; diversity/homogeneity; governance; democratization
Transmission of Policy Shocks in a Monetary Asset-Pricing Model
In a framework of a two-country monetary asset-pricing model with production the effects of stochastic and structural fiscal and monetary policy shocks are investigated. The model is kept simple enough to allow the derivation of closed form solutions of the functional equation system for the equilibrium price functions. With money yielding liquidity services in the exchange process some correlation results are derived, especially for the impact of structural and stochastic policy shocks on stock prices, exchange rates etc. Furthermore it is investigated whether shares can provide protection against inflation resulting from monetary shocks.
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