White Rose University Consortium logo
University of Leeds logo University of Sheffield logo York University logo

The abrupt development of penumbrae in sunspots

Rucklidge, A.M., Schmidt, H.U. and Weiss, N.O. (1995) The abrupt development of penumbrae in sunspots. Monthly Notices of the Royal Astronomical Society, 273 (2). pp. 491-498. ISSN 0035-8711


Download (205Kb)


A sunspot is distinguished from a pore by having a filamentary penumbra, corresponding to convective motions that carry energy into the spot from the surrounding field-free plasma. A simplified model of energy transport in sunspots is developed in order to model the transition from pores to spots as the magnetic flux is varied. The observed overlap between the radii of large pores and small spots implies that the filamentary convective mode sets in suddenly and rapidly, as in the idealized case where pore solutions lose stability at a bifurcation.

Item Type: Article
Copyright, Publisher and Additional Information: Copyright © 1995 Royal Astronomical Society. This is an author produced version of an article published in Monthly Notices of the Royal Astronomical Society. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination.
Keywords: sun, magnetic fields, sunspots, convection, MHD
Institution: The University of Leeds
Academic Units: The University of Leeds > Faculty of Maths and Physical Sciences (Leeds) > School of Mathematics (Leeds) > Applied Mathematics (Leeds)
Depositing User: A. M. Rucklidge
Date Deposited: 06 Feb 2006
Last Modified: 13 Jun 2014 10:08
Published Version: http://articles.adsabs.harvard.edu/cgi-bin/nph-jou...
Status: Published
Refereed: Yes
URI: http://eprints.whiterose.ac.uk/id/eprint/980

Actions (repository staff only: login required)