Hostname: page-component-cd9895bd7-gbm5v Total loading time: 0 Render date: 2024-12-27T08:04:20.907Z Has data issue: false hasContentIssue false
  • English
  • Français

Small Scale Solar Magnetic Fields: Theory

Published online by Cambridge University Press:  30 March 2016

N. O. Weiss
N. O. Weiss*
Affiliation:
Department of Applied Mathematics and Theoretical Physics, University of Cambridge

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

One of the most exciting developments in solar physics over the past eight years has been the success of ground based observers in resolving features with a scale smaller than the solar granulation. In particular, they have demonstrated the existence of intense magnetic fields, with strengths of up to about 1600G. Harvey (1976) has just given an excellent summary of these results.

In solar physics, theory generally follows observations. Inter-granular magnetic fields had indeed been expected but their magnitude came as a surprise. Some problems have been discussed in previous reviews (Schmidt, 1968, 1974; Weiss, 1969; Parker, 1976d; Stenflo, 1976) and the new observations have stimulated a flurry of theoretical papers. This review will be limited to the principal problems raised by these filamentary magnetic fields. I shall discuss the interaction of magnetic fields with convection in the sun and attempt to answer such questions as: what is the nature of the equilibrium in a flux tube? how are the fields contained? what determines their stability? how are such strong fields formed and maintained? and what limits the maximum field strength?

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. 241 - 250
Copyright
Copyright © Reidel 1977

References

Beckers, J. M.: 1976, Astrophys. J., 203, 739.Google Scholar
Bernstein, I. B., Frieman, E. A., Kruskal, M. D. and Kulsrud, R. M.: 1958, Proc. Roy. Soc. A, 244, 17.Google Scholar
Busse, F. H.: 1975, J. Fluid Mech. 71, 193.Google Scholar
Chapman, G. A.: 1974, Astrophys. J., 191, 255.CrossRefGoogle Scholar
Clark, A.: 1965, Phys. Fl., 7, 1455.Google Scholar
Clark, A.: 1966, Phys. Fl., 9, 485.Google Scholar
Clark, A. and Johnson, A. C: 1967, Solar Phys., 2, 433.Google Scholar
Cowling, T. G.: 1976a, Magnetohydrodynamics, Hilger, Bristol.Google Scholar
Cowling, T. G.: 1976b, Mon. Not. R. Astr. Soc, in press.Google Scholar
Deinzer, W.: 1965, Astrophys. J., 141, 548.Google Scholar
Deubner, F. L.: 1976, Astron. Astrophys., 47, 47.Google Scholar
Dunn, R. B. and Zirker, J. B.: 1973, Solar Phys., 33, 281.Google Scholar
Durrant, C. J.: 1976, these proceedings.Google Scholar
Galloway, D. J.: 1976, Ph.D. dissertation, University of Cambridge.Google Scholar
Galloway, D. J., Proctor, M. R. E. and Weiss, N. O.: 1976, to be published.Google Scholar
Graham, E.: 1975, J. Fluid Mech., 70, 689.Google Scholar
Harvey, J.: 1976, these proceedings.Google Scholar
Kirk, J. G. and Livingston, W.: 1968, Solar Phys., 3, 510.CrossRefGoogle Scholar
Krause, F.: 1976, in Bumba, V. and Kleczek, J. (eds), Basic mechanisms of solar activity. Reidel, Dordrecht.Google Scholar
Mehltretter, J. P.: 1974, Solar Phys., 38, 43.Google Scholar
Meyer, F., Schmidt, H. U. and Weiss, N. O.: 1976, to be published.Google Scholar
Meyer, F., Schmidt, H. U., Weiss, N. O. and Wilson, P. R.: 1974, Mon. Not. R. Astr. Soc., 169, 35.CrossRefGoogle Scholar
Parker, E. N.: 1963, Astrophys. J., 138, 552.CrossRefGoogle Scholar
Parker, E. N.: 1974a, Astrophys. J., 189, 563.Google Scholar
Parker, E. N.: 1974b, Astrophys. J., 190, 429.Google Scholar
Parker, E. N.: 1974c, Solar Phys., 36, 249.CrossRefGoogle Scholar
Parker, E. N.: 1974d, Solar Phys., 37, 127.Google Scholar
Parker, E. N.: 1975a, Solar Phys., 40, 275.Google Scholar
Parker, E. N.: 1975b, Solar Phys., 40, 291.Google Scholar
Parker, E. N.: 1976a, Astrophys. J., 204, 259.Google Scholar
Parker, E. N.: 1976b, Astrophys. J., (in press).Google Scholar
Parker, E. N.: 1976c, Astrophys. J., (in press).Google Scholar
Parker, E. N.: 1976d, in Bumba, V. and Kleczek, J. (eds), Basic mechanisms of solar activity, Reidel, Dordrecht.Google Scholar
Peckover, R. S. and Weiss, N. O.: 1972, Computer Phys. Comm., 4, 339.CrossRefGoogle Scholar
Peckover, R. S. and Weiss, N. O.: 1976, to be published.Google Scholar
Piddington, J. H.: 1974, in Athay, R. G. (ed.), Chromospheric fine structure, p. 269, Reidel, Dordrecht.Google Scholar
Piddington, J. H.: 1975a, Astrophys. Space Sci., 34, 347.Google Scholar
Piddington, J. H.: 1975b, Astrophys. Space Sci., 35, 269.CrossRefGoogle Scholar
Piddington, J. H.: 1975c, Astrophys. Space sci., 38, 157.CrossRefGoogle Scholar
Piddington, J. H.: 1976a, Astrophys. Space sci., 40, 73.Google Scholar
Piddington, J. H.: 1976b, Astrophys. Space sci., 41, 79.Google Scholar
Piddington, J. H.: 1976c, Astrophys. Space sci. (in press).Google Scholar
Piddington, J. H.: 1976d, in Bumba, V. and Kleczek, J. (eds), Basic mechanisms of solar activity, Reidel, Dordrecht.Google Scholar
Ribes, E. and Unno, W.: 1976 Astron. Astrophys., in press.Google Scholar
Schmidt, H. U.: 1968, in Kiepenheuer, K. O. (ed.), Structure and development of solar active regions, p. 95, Reidel, Dordrecht.Google Scholar
Schmidt, H. U.: 1974, in Athay, R. G. (ed.), Chromospheric fine structure, p. 35, Reidel Dordrecht.Google Scholar
Simon, G. W. and Weiss, N. O.: 1970, Solar Phys., 13, 85.Google Scholar
Simon, G. W. and Zirker, J. B.: 1974, Solar Phys., 35, 331.Google Scholar
Spruit, H. C: 1976, to be published.Google Scholar
Sreenivasan, S. R.: 1973, Physica, 67, 330.Google Scholar
Stenflo, J. O.: 1975, Solar Phys., 42, 79.CrossRefGoogle Scholar
Stenflo., J. O.: 1976, in V., Bumba and J., Kleczek (eds), Basic mechanisms of solar activity, p. 69, Reidel, Dordrecht.Google Scholar
Unno, W., Ribes, E. and Appenzeller, I.: 1974, Solar Phys., 35, 287.Google Scholar
Weiss, N. O.: 1964, Phil. Trans. Roy. Soc. A. 256, 99.Google Scholar
Weiss, N. O.: 1966, Proc. Roy. Soc. A, 128, 225.Google Scholar
Weiss, N. O.: 1969, in Wentzel, D. G. and Tidman, D. E. (eds), Plasma instabilities in astrophysics, p. 153, Gordon and Breach, New York.Google Scholar
Weiss, N. O.: 1975, Adv. Chem. Phys., 32, 101.Google Scholar
Wilson, P. R.: 1976a, to be published.Google Scholar
Wilson, P. R.: 1976b, to be published.Google Scholar
Zwaan, C: 1967, Solar Phys., 1, 478.CrossRefGoogle Scholar