Solar Physics

, Volume 78, Issue 1, pp 59–66 | Cite as

The angle of inclination of the sunspot symmetry axis to the solar surface

  • Saken Obashevich Obashev
  • Rimma Khaliullovna Gainullina
  • Tamara Mikhajlovna Minasyants
  • Gennadij Sergeevich Minasyants
Article
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Revised:

Abstract

The Wilson effect, used before only as a method of determining the physical depression of sunspots, is used here to estimate a quite different parameter - the sunspot symmetry axis inclination angle to the solar surface, this explains the observed negative Wilson effect.

On the basis of photoheliograms taken with three telescopes of the High-Altitude Solar observatory ‘Peak Alma-Ata’, the Wilson effect for the whole solar disk is investigated, the east and west parts of the disk being studied separately. 111 sunspots of regular shape at different heliocentric angles were measured, eight of them being under observations from one limb to the other. To study the dependence of the Wilson effect on the heliocentric angle, all observations within an angular interval of 10° were averaged. The dependence thus derived is described by two sinusoids having the zero point shifted along both axes. The shift of the zero Wilson effect to the west, i.e., a shift along the heliocentric angle axis, can be caused by the deviation of the sunspot axis to the east from the normal to the solar surface. On the ‘line of sight-normal’ plane the angle corresponding to this deviation is ψ=34°±14°.

Keywords

Depression Symmetry Axis Inclination Angle Solar Disk Solar Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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References

  1. Bray, R. J. and Loughhead, R. E.: 1964, Sunspots, Chapman and Hall, Ltd, London.Google Scholar
  2. Bumba, V.: 1960, Izv. Krymsk. Astrofiz. Obs. 23, 212.Google Scholar
  3. Chistyakov, V. F.: 1961, Astron. Zh. 38, 617.Google Scholar
  4. Chistyakov, V. F.: 1962, Astron. Zh. 39, 459.Google Scholar
  5. Ioshpa, B. A. and Obridko, V. N.: 1965, Soln. Dann. No. 3, p. 54.Google Scholar
  6. Mattig, W.: 1969, Solar Phys. 8, 291.Google Scholar
  7. Obashev, S. O. and Minasyants, G. S.: 1971, USSR Avtorsk. svid. No. 31151, 21 September 1971.Google Scholar
  8. Obashev, S. O. and Minasyants, G. S.: 1973, Soln. Dann. No. 2, p. 113.Google Scholar
  9. Obashev, S. O., Gainullina, R. Kh., Minasyants, T. M., and Minasyants, G. S.: 1981, Vestnik AN Kaz. SSR No. 3, p. 36.Google Scholar
  10. Obridko, V. N. and Teplitskaya, R. B.: 1976, Fizika Sol. Pyaten, Trudy VII Konsul't. Soveshch. Fiz. Soln., Moskva, p. 3.Google Scholar
  11. Prokakis, Th.: 1974, Solar Phys. 35, 105.Google Scholar
  12. Sandner, Dr. W.: 1960, Die Sterne 36, 242.Google Scholar
  13. Spandenberg, W. W.: 1977, Die Sterne 53, 99.Google Scholar
  14. Stepanov, V. E. and Gopasyuk, S. I.: 1963, Izv. Krymsk. Astrofiz. Obs. 28, 194.Google Scholar
  15. Teplitskaya, R. B. and Efendieva, S. A.: 1974, Soln. Dann. No. 11, p. 66.Google Scholar
  16. Wilson, P. R. and Cannon, C. J.: 1968, Solar Phys. 4, 3.Google Scholar
  17. Wilson, P. R. and McIntosh, P. S.: 1969, Solar Phys. 10, 370.Google Scholar

Copyright information

© D. Reidel Publishing Company 1982

Authors and Affiliations

  • Saken Obashevich Obashev
    • 1
  • Rimma Khaliullovna Gainullina
    • 1
  • Tamara Mikhajlovna Minasyants
    • 1
  • Gennadij Sergeevich Minasyants
    • 1
  1. 1.High-Altitude Solar Observatory ‘Peak Alma-Ata’ of the Astrophysical Institute of the Academy of Sciences of the Kazakh SSRU.S.S.R.

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