Dynamo in Astrophysics

ASTROPHYSICS Parity properties of an advection-dominated solar α 2 Ω-dynamo

We have developed a high-precision code which solves the kinematic dynamo problem both for given rotation law and meridional flow in the case of a low eddy diffusivity of the order of 10 11 cm 2 /s known from the sunspot decay. All our models work with an α-effect which is positive (negative) in the northern (southern) hemisphere. It is concentrated in radial layers located either at the top or...

The Madison plasma dynamo experiment: A facility for studying laboratory plasma astrophysics

Astrophysics.

Using the oscillation frequencies of α Cen A recently discovered by Bouchy & Carrier (2001, 2002), the available astrometric, photometric and spectroscopic data, we tried to improve the calibration of the visual binary system α Cen. With the revisited masses of Pour-baix et al. (2002) we do not succeed to obtain a solution satisfying all the seismic observational constraints. Relaxing the const...

Generating Process Explanations in Nuclear Astrophysics Generating Explanations in Astrophysics

In this paper we describe ASTRA, a computational aid for generating process explanations in nuclear astrophysics. The system operates in two stages, the rst using knowledge of quantum theory to produce a set of legal reactions among elements and the second searching for pathways of such reactions that explain the evolution of some element in terms of lighter ones. ASTRA has found apparently nov...

Astrophysics.