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Solar Physics

, Volume 170, Issue 2, pp 389–410 | Cite as

PERIODICITIES IN THE NORTH–SOUTH ASYMMETRY OF THE SOLAR DIFFERENTIAL ROTATION AND SURFACE MAGNETIC FIELD

  • J. Javaraiah
  • M. H. Gokhale
Article

Abstract

We have studied the temporal variations in the north–south asymmetries of the differential rotation parameters A, B, and the ‘mean’ rotation rate Ā, by determining their values from Greenwich data for sunspot groups (1879–1976) in the northern and southern hemispheres, during moving time intervals of lengths 3 yr and 5 yr, successively displaced by 1 yr. The variation in the north–south asymmetry (Ā\(a \)) of Ā is similar to the variation in the asymmetry (B\(a \)) of B but with opposite sign. These variations of Ā\(a \) and B\(a \) may represent components of an anti-symmetric torsional oscillation which are in opposite phase with each other.

The FFT and MEM analyses of the temporal variations of B\(a \) , Ā\(a \) , and the north–south asymmetry (A\(a \) ) of A, show existence of significant periodicities: 45.5 ± 11.5 yr,21.3 ± 4.5 yr, 13.3 ± 1.5 yr, and 10.5 ± 0.5 yr. These analyses also show a few other possible periodicities in A\(a \) , B\(a \) , and Ā\(a \) . All these periodicities are also seen in the north–south asymmetry of sunspot activity (with similar relative magnitudes). The 22-yr periodicity was seen in ‘even-parity’ modes of magnetic field inferred from sunspot data.

Keywords

Magnetic Field Temporal Variation Southern Hemisphere Rotation Rate Relative Magnitude 
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. Attolini, M. R., Cecchini, S., Galli, M., and Nanni, T.: 1990, Il Nuovo Cimento 13C, 131.Google Scholar
  2. Balthasar, H., Vázquez, M., and Wöhl, H.: 1986, Astron. Astrophys. 155, 87.Google Scholar
  3. Bracewell, R. N.: 1988, Monthly Notices Roy. Astron. Soc. 230, 535.Google Scholar
  4. Brault, J. W. and White, O. R.: 1971, Astron. Astrophys. 13, 169.Google Scholar
  5. Carbonell, M., Oliver, R., and Ballester, J. L.: 1993, Astron. Astrophys. 274, 497.Google Scholar
  6. Cohen, T. J. and Lintz, P. R.: 1974, Nature 250, 398.Google Scholar
  7. Csada, I. K.: 1974, Solar Phys. 35, 325.Google Scholar
  8. Fairbridge, R. W. and Marcel, C. H.: 1977, Nature 268, 413.Google Scholar
  9. Gilman, P. A. and Howard, R.: 1984, Astrophys. J. 283, 385.Google Scholar
  10. Gokhale, M. H. and Javaraiah, J.: 1990, Monthly Notices Roy. Astron. Soc. 243, 241.Google Scholar
  11. Gokhale, M. H. and Javaraiah, J.: 1995, Solar Phys. 156, 157.Google Scholar
  12. Gokhale, M. H., Javaraiah, J., Kutty, K. N., and Varghese, B. A.: 1992, Solar Phys. 138, 35.Google Scholar
  13. Hathaway, D. H. and Wilson, R. M.: 1990, Astrophys. J. 357, 271.Google Scholar
  14. Howard, R. and LaBonte, J.: 1983, in J. O. Stenflo (ed.), ‘Solar and Stellar Magnetic Fields: Origin and Coronal Effects’, IAU Symp. 102, 101.Google Scholar
  15. Javaraiah, J. and Gokhale, M. H.: 1995, Solar Phys. 158, 173 (Paper I).Google Scholar
  16. Koyama, H.: 1985, Observation of Sunspots 1947 - 1984, Kawadeshoboshinsha, Tokyo.Google Scholar
  17. Layzer, D., Rosner, R., and Doyle, H. T.: 1979, Astrophys. J. 229, 1126.Google Scholar
  18. Ota'ola, J. A. and Zenteno, G.: 1983, Solar Phys. 89, 209.Google Scholar
  19. Piddington, J. H.: 1976, in V. Bumba and J. Kleczek (eds.), ‘Basic Mechanisms of Solar Activity’, IAU Symp. 71, 389.Google Scholar
  20. Pierce, A. K. and Lopresto, J. C.: 1984, Solar Phys. 93, 155.Google Scholar
  21. Ribes, E., Ribes, J. C., and Barthalot, R.: 1987, Nature 326, 52.Google Scholar
  22. Schüssler, M.: 1987, in B. R. Durney and S. Sofia (eds.), ‘The Internal Solar Angular Velocity’, Astrophysics and Space Science Library 137, 303.Google Scholar
  23. Snodgrass, H. B.: 1984, Solar Phys. 94, 13.Google Scholar
  24. Snodgrass, H. B. and Howard, R.: 1985, Solar Phys. 95, 221.Google Scholar
  25. Sokoloff, D. and Ribes, E. N.: 1994, Astron. Astrophys. 288, 293.Google Scholar
  26. Stenflo, J. O. and Vogel, M.: 1986, Nature 319, 285.Google Scholar
  27. Swinson, D. B., Koyama, H., and Saito, T.: 1986, Solar Phys. 106, 35.Google Scholar
  28. Tuominen, I. and Virtanen, H. C.: 1987, in B. R. Durney and S. Sofia (eds.), ‘The Internal Solar Angular Velocity’, Astrophysics and Space Science Library 137, 83.Google Scholar
  29. Ulrych, T. J. and Bishop, T. N.: 1975, Rev. Geophys. Space Phys. 13, 183.Google Scholar
  30. Verma, V. K.: 1993, Astrophys. J. 403, 797.Google Scholar
  31. Vizoso, G. and Ballester, J. L.: 1990, Astron. Astrophys. 229, 540.Google Scholar
  32. Ward, F.: 1965, Astrophys. J. 141, 534.Google Scholar
  33. Ward, F.: 1966, Astrophys. J. 145, 416.Google Scholar
  34. White, O. R. and Trotter, D. E.: 1977, Astrophys. J. Suppl. 33, 391.Google Scholar
  35. Wolf, C. L.: 1976, Astrophys. J. 205, 612.Google Scholar
  36. Yi, W.: 1992, J. Roy. Astron. Soc. Canada 86, 635.Google Scholar

Copyright information

© Kluwer Academic Publishers 1997

Authors and Affiliations

  • J. Javaraiah
    • 1
  • M. H. Gokhale
    • 1
  1. 1.Indian Institute of AstrophysicsIndia

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