Abstract
Mount Wilson synoptic data of both plages and sunspots are examined in an effort to determine in some detail the manner of the appearance and disappearance of the magnetic flux of active regions at the solar surface. Separating regions into leading and following portions by magnetic polarity in the case of the plages and by position in the case of sunspots (for which there is no magnetic information available in this data set), various characteristics of these features are studied, namely their rotation, their relative longitudinal motions, and the east-west inclinations of their magnetic fields. The evidence, taken together, suggests that the magnetic flux loops which comprise a region rise to the surface at the time of its formation, and (at least some of them) sink back below the surface at the time of the decay of the region. It is likely that not all the magnetic flux that arises sinks again below the surface.
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Arévalo, M. J., Gomez, R., Vázquez, M., Balthasar, H., and Wöhl, H.: 1982, Astron. Astrophys. 111, 256.
Balthasar, H., Vázquez, M., and Wöhl, H.: 1986, Astron. Astrophys. 155, 87.
Brants, J. J.: 1985, Thesis, Utrecht University.
Bruzek, A.: 1967, Solar Phys. 2, 451.
Bumba, V. and Howard, R.: 1965, Astrophys. J. 141, 1502.
Bumba, V. and Howard, R.: 1969, Solar Phys. 7, 28.
Bumba, V., Howard, R., Martres, M. J., and Soru-Isovici, I.: 1968, in K. O. Kiepenheuer (ed.), ‘Structure and Development of Solar Active Regions’, IAU Symp. 35, 13.
Gilman, P. A. and Howard, R.: 1984, Astrophys. J. 283, 385.
Gilman, P. A. and Howard, R.: 1985, Astrophys. J. 295, 233.
Godoli, G. and Mazucconi, F.: 1979, Solar Phys. 64, 247.
Greenwich Observers: 1925, Monthly Notices Roy. Astron. Soc. 85, 553.
Harvey, K. and Harvey, J: 1973, Solar Phys. 28, 61.
Howard, R. F.: 1989, Solar Phys. 123, 271.
Howard, R. F.: 1990, Solar Phys. 126, 299.
Howard, R. F.: 1991a, Solar Phys. 132, 257.
Howard, R. F.: 1991b, Solar Phys. 135, 43.
Howard, R. F.: 1991c, Solar Phys. 135, 327.
Howard, R. F.: 1991d, Solar Phys. 134, 233.
Howard, R. F.: 1992a, Solar Phys. 137, 205.
Howard, R. F.: 1992b, in K. L. Harvey (ed.), Proceedings of the Solar Cycle Workshop, Astron. Soc. of the Pacific, San Francisco, p. 297.
Howard, R. F. and LaBonte, B. J.: 1981, Solar Phys. 74, 131.
Howard, R., Gilman, P. A., and Gilman, P. I.: 1984, Astrophys. J. 283, 373.
Leighton, R. B.: 1964, Astrophys. J. 140, 1547.
Martin, S. F.: 1984, in S. Keil (ed.), Small-Scale Dynamic Processes in Quiet Stellar Atmospheres, National Solar Observatory, p. 30.
Martin, S. F., Livi, S. H. B., and Wang, J.: 1985, Australian J. Phys. 38, 929.
Sheeley, N. R. Jr., Nash, A. G., and Wang, Y.-M.: 1987, Astrophys. J. 319, 481.
Švestka, Z., Krieger, A. S., Chase, R. C., and Howard, R.: 1977, Solar Phys. 52, 69.
Ternullo, M., Zappalà, R. A., and Zucarello, F.: 1981, Solar Phys. 74, 111.
Waldmeier, M.: 1939, Astron. Mitt. Zürich 14, No. 138.
Waldmeier, M.: 1941, Ergebnisse und Probleme der Sonnenforschung, Springer-Verlag, Berlin.
Wang, H., Zirin, H., and Ai, G.: 1991, Solar Phys. 131, 53.
Ward, F.: 1966, Astrophys. J. 145, 416.
Zirin, H.: 1974, in R. G. Athay (ed.), ‘Chromospheric Fine Structure’, IAU Symp. 56, 161.
Zwaan, C.: 1978, Solar Phys. 60, 213.
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Howard, R.F. Some characteristics of the development and decay of active region magnetic flux. Sol Phys 142, 47–65 (1992). https://doi.org/10.1007/BF00156633
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DOI: https://doi.org/10.1007/BF00156633