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Published online by Cambridge University Press:  30 March 2016

J. Harvey
J. Harvey*
Affiliation:
Kitt Peak National Observatory*, Tucson, Arizona U.S.A.

Extract

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If the Sun is observed like a star, without spatial resolution, its magnetic field seldom exceeds 1 Gauss. But with high spatial resolution the field is seen to be largely concentrated into kG structures. Observations of the structure and dynamics of solar magnetic fields can therefore provide a guide to the nature of magnetic fields of other stars which cannot be resolved. Solar activity and the structure of the chromosphere and inner corona are intimately linked with magnetism and a complete understanding of these features often depends on magnetic field details. There are unsolved physical problems involving solar magnetic fields which have challenged many physicists. For example, confinement of small-scale fields in kG structures is a problem of current interest (Parker, 1976; Piddington, 1976; Spruit, 1976). Solar observers are no less challenged since the Sun presents us with a complicated magnetic field having a range of scales from global to less than the scale of our best observations as illustrated in Figures 1, 2, and 3. This paper is a survey of observational techniques and results at the small-scale end of the spectrum of sizes in the solar photosphere. This topic has been frequently reviewed (e.g. Athay, 1976; Beckers, 1976; Deubner, 1975; Howard, 1972; Mullan, 1974; Severny, 1972; Stenflo, 1975) so that recent work is emphasized here.

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. 223 - 239
Copyright
Copyright © Reidel 1977

References

Athay, R. G.: 1976, The Solar Chromosphere and Corona: Quiet Sun, Reidel, D., Dordrecht, Ch. 4.Google Scholar
Beckers, J. M.: 1971, in Howard, R. (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 3.Google Scholar
Beckers, J. M.: 1975, Environmental Research Papers 499, Air Force Cambridge Research Laboratories.Google Scholar
Beckers, J. M.: 1976, to be published in the Proceedings of the AGU International Symposium on Solar Terrestrial Physics (Boulder, Colorado).Google Scholar
Beckers, J. M. and Schröter, E. H.: 1968, Solar Phys. 4, 142.Google Scholar
Chapman, G. A.: 1972, Solar Phys. 26, 299.Google Scholar
Chapman, G. A.: 1976, submitted to Astrophys. J.Google Scholar
Chapman, G. A. and Sheeley, N. R.: 1968, Solar Phys. 5, 442.Google Scholar
Deubner, F.-L.: 1975, Oss. e Mem. Oss. Aractri, no. 105, 39.Google Scholar
Dunn, R. B. and Zirker, J. B.: 1973, Solar Phys. 33, 281.Google Scholar
Efanov, V. A., Moiseev, I. G., and Severny, A. B.: 1974, Nature 249, 330 (also Izv. Krymsk. Astrofiz. Obs. 53, 121).Google Scholar
Frazier, E. N.: 1970, Solar Phys. 14, 89.Google Scholar
Frazier, E. N.: 1974, Solar Phys. 38, 69.Google Scholar
Frazier, E. N. and Stenflo, J. O.: 1972, Solar Phys. 27, 330.Google Scholar
Giovanelli, R. G. and Ramsay, J. V.: 1971, in Howard, R. (ed.) ‘Solar Magnetic Fields’, IAU Symp. 43, 293.Google Scholar
Gopasyuk, S. I., Kotov, V. A., Severny, A. B. and Tsap, T. T.: 1973, Solar Phys. 31, 307.Google Scholar
Harvey, J. and Hall, D.: 1975, Bull. Am. Astron. Soc. 7, 459.Google Scholar
Harvey, J. and Livingston, W.: 1969, Solar Phys. 10, 283.Google Scholar
Heasley, J.: 1976, personal communication.Google Scholar
Howard, R.: 1972, in C. P., Sonnett, P. J., Coleman and J. M., Wilcox (eds.) ‘Solar Wind’, NASA SP-308, 3.Google Scholar
Howard, R. and Bhatnagar, A.: 1969, Solar Phys. 10, 245.Google Scholar
Howard, R. and Stenflo, J. O.: 1972, Solar Phys. 22, 402.Google Scholar
Jäger, F. W.: 1972, Solar Phys. 27, 481.Google Scholar
Liu, S.-Y.: 1974, Solar Phys. 39, 297.Google Scholar
Livingston, W. C. and Harvey, J.: 1975, Bull. Am. Astron. Soc. 7, 346.Google Scholar
Lynch, D. K.: 1974, Bull. Am. Astron. Soc. 6, 191.Google Scholar
Mehltretter, J. P.: 1974, Solar Phys. 38, 43.Google Scholar
Mullan, D. J.: 1974, J. Franklin Inst. 298, 341.Google Scholar
Parker, E. N.: 1976, Astrophys. J. 204, 259.Google Scholar
Piddington, J. H.: 1976, Astrophys. Space Sci. 40, 73.CrossRefGoogle Scholar
Schoolman, S. A. and Ramsey, H. E.: 1976, Solar Phys., in press.Google Scholar
Schröter, E. H.: 1973, Mitt. Astron. Ges. 32, 55.Google Scholar
Seares, F. H.: 1913, Astrophys. J. 38, 99.Google Scholar
Semel, M.: 1971, in Howard, R. (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 37.Google Scholar
Severny, A. B.: 1966, Soviet Astron. - A. J. 10, 367.Google Scholar
Severny, A. B.: 1972, in Dyer, E. R. (ed.) ‘Solar Terrestrial Physics/1970’, Astrophys. Sp. Science Library 29, 38.Google Scholar
Severny, A. B.: 1976, personal communication.Google Scholar
Sheeley, N. R.: 1966, Astrophys. J. 144, 723.CrossRefGoogle Scholar
Sheeley, N. R.: 1967, Solar Phys. 1, 171.Google Scholar
Sheeley, N. R.: 1971, in Howard, R. (ed.) ‘Solar Magnetic Fields’, IAU Symp. 43, 310.Google Scholar
Simon, G. W. and Zirker, J. B.: 1974, Solar Phys. 35, 331.Google Scholar
Skumanich, A., Smythe, C., and Frazier, E. N.: 1975, Astrophys. J. 200, 747.Google Scholar
Smithson, R. C.: 1973, Solar Phys. 29, 365.Google Scholar
Smithson, R. C.: 1975, Bull. Am. Astron. Soc. 7, 346.Google Scholar
Spruit, H. C.: 1976, preprint.Google Scholar
Staude, J.: 1974, Z. Meteorologie 24, 214.Google Scholar
Stellmacher, G. and Wiehr, E.: 1971, Solar Phys. 18, 220.Google Scholar
Stenflo, J. O.: 1966, Ark. Astron. 4, 173.Google Scholar
Stenflo, J. O.: 1968, Acta Univ. Lund. II, no. 2.Google Scholar
Stenflo, J. O.: 1971, in Howard, R. (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 101.Google Scholar
Stenflo, J. O.: 1973, Solar Phys. 32, 41.Google Scholar
Stenflo, J. O.: 1975, in Bumba, V. and Kleczek, J. (eds.), ‘Basic Mechanisms of Solar Activity’, IAU Symp. 71, in press.Google Scholar
Stenflo, J. O.: 1975, Solar Phys. 42, 79.Google Scholar
Steshenko, N. V.: 1967, Izv. Krymsk Astrofiz. Obs. 37, 21.Google Scholar
Svalgaard, L.: 1976, personal communication.Google Scholar
Tarbell, T. D. and Title, A. M.: 1975, Bull, Am. Astron. Soc. 7, 459.Google Scholar
Title, A. M. and Andelin, J. P.: 1971, in Howard, R. (ed.) ‘Solar Magnetic Fields’, IAU Symp. 43, 298.Google Scholar
Title, A. M. and Tarbell, T. D.: 1975, Solar Phys. 41, 255.Google Scholar
Unno, W.: 1956, Pub. Astron. Soc. Japan 8, 108.Google Scholar
Unno, W.: 1959, Astrophys. J. 129, 375.Google Scholar
Vrabec, D.: 1974, in Athay, R. G. (ed.), ‘Chromospheric Fine Structure’, IAU Symp. 56, 224.Google Scholar
Wiehr, E.: 1971, Solar Phys. 18, 226.Google Scholar
Wiehr, E.: 1976, personal communication.Google Scholar