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Flows in Magnetic Flux Tubes

Published online by Cambridge University Press:  30 March 2016

C. J. Durrant
C. J. Durrant*
Affiliation:
Fraunhofer-Institut, Freiburg

Extract

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Harvey has reported in this discussion observations of mean downflows in magnetic elements that increase in speed with depth. It is therefore pertinent to ask what role such flows may play in the production and maintainance of the flux concentrations.

Equilibrium Models

The first thing to be said is that such flows cannot directly influence the horizontal momentum balance, i.e. their dynamic pressure is negligible.

A steady internal flow such as that proposed by Ribes and Unno (1975) for chromospheric concentration would require supersonic flows with very large curvature at photospheric levels. There is no evidence for transverse flows of such magnitude.

Type
Joint Dicussions
Information
Highlights of Astronomy , Volume 4 , Issue 2: Highlights of Astronomy. As presented at the XVIth General Assembly of the IAU, 1976 (Part II) , 1977 , pp. 267 - 270
Copyright
Copyright © Reidel 1977

References

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Ribes, E., and Unno, W.: 1975, Proc. First European Solar Meeting, Feb. 1975, Firenze, p. 52 Google Scholar
Sreenivasan, S. R.: 1973, Physica 67, 323, 330.Google Scholar
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