On global solar dynamo simulations

Show full item record



Permalink

http://hdl.handle.net/10138/26085

Citation

Käpylä , P J 2011 , ' On global solar dynamo simulations ' , Astronomische Nachrichten , vol. 332 , no. 1 , pp. 43-50 . https://doi.org/10.1002/asna.201012345

Title: On global solar dynamo simulations
Author: Käpylä, P. J.
Contributor: University of Helsinki, Department of Physics
Date: 2011
Language: eng
Number of pages: 7
Belongs to series: Astronomische Nachrichten
ISSN: 0004-6337
URI: http://hdl.handle.net/10138/26085
Abstract: 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 years many fundamental issues in dynamo theory have been studied in detail by means of local numerical simulations that simplify the problem and allow the study of physical effects in isolation. Global simulations, however, continue to suffer from the age-old problem of too low spatial resolution, leading to much lower Reynolds numbers and scale separation than in the Sun. Reproducing the internal rotation of the Sun, which plays a crucual role in the dynamo process, has also turned out to be a very difficult problem. In the present paper the current status of global dynamo simulations of the Sun is reviewed. Emphasis is put on efforts to understand how the large-scale magnetic fields, i.e. whose length scale is greater than the scale of turbulence, are generated in the Sun. Some lessons from mean-field theory and local simulations are reviewed and their possible implications to the global models are discussed. Possible remedies to some of the current issues of the solar simulations are put forward.
Subject: astro-ph.SR
115 Astronomy, Space science
Rights:


Files in this item

Total number of downloads: Loading...

Files Size Format View
1010.1249v1 142.0Kb PDF View/Open

This item appears in the following Collection(s)

Show full item record