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Astron. Astrophys. 324, 11-14 (1997)

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Heating of coronal loops by phase-mixing

A.W. Hood 1, D. González-Delgado 2 and J. Ireland 1

1 Department of Mathematical and Computational Sciences, University of St Andrews, St Andrews, KY16 9SS, UK
2 Instituto de Astrofisica de Canarias, C/ Via Lactea s/n, E-38200 La Laguna, Tenerife, Spain

Received 25 October 1996 / Accepted 27 January 1997


A simple, self similar solution for the heating of coronal loops is presented. It is shown that the Heyvaerts-Priest model gives a good description of phase mixing in a certain class of coronal loops. In addition, under typical coronal conditions the ohmic heating, due to phase mixing, can provide magnetic energy on a timescale comparable with the coronal radiative time. Thus, it is possible that phase mixing can maintain a hot coronal loop for large Lundquist number. If the photospheric motions continually excite coronal loops, then phase mixing could contribute to a background level of coronal heating for very large Lundquist number.

Key words: MHD – Sun: corona

Send offprint requests to: A. W. Hood

© European Southern Observatory (ESO) 1997

Online publication: May 26, 1998