Advertisement

Solar Physics

, Volume 128, Issue 1, pp 269–280 | Cite as

160 minute solar variations and the 22 year cycle

  • V. A. Kotov
  • T. T. Tsap
Article

Abstract

Systematic measurements of the differential Doppler velocity of the Sun have been performed in Crimea from 1974 through 1988 (total 987 days, 6197 hours of observations). They confirm the presence of a long-term phase-coherent solar pulsation with a period of 160.010 min. On the other hand, the analysis of new data suggests that solar 160 min pulsation might, in frequency, have a multiplet fine structure. In particular, large changes of amplitude and phase of the pulsation over the years 1982–1986 may indicate that during the last few years we have been observing the solar 160 min oscillation of the ‘second portion’ of the 22 year solar cycle.

It is further noted that the beat period of the two closely spaced frequencies (periods are 160.0101 and 160.0126 min) equals 19.5 ± 1.1 year, which is in good agreement with the average length of the solar magnetic activity cycle, 20–22 years. Being verified, this unpredicted property of the pulsation can offer a novel possibility for probing the Sun's interior and perhaps for the study of the internal rotation and 11(22) year cycle of a star.

Keywords

Fine Structure Systematic Measurement Average Length Large Change Solar Cycle 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Berthomieu, G. and Provost, J.: 1989, Astron. Astrophys. (submitted).Google Scholar
  2. Brookes, J. R., Isaak, G. R., and van der Raay, H.B.: 1976, Nature 259, 92.Google Scholar
  3. Elsworth, Y. P., Jefferies, S. M., McLeod, C. P., New, R., Pallé, P. L., van der Raay, H. B., Régulo, G., and Roca Cortés, T.: 1989, Astrophys. J. 338, 557.Google Scholar
  4. Gelly, B., Fossat, E., and Grec, G.: 1988, Astron. Astrophys. 200, L29.Google Scholar
  5. Grec, G., Fossat, E., and Pomerantz, M.: 1980, Nature 288, 541.Google Scholar
  6. Henning, H. M. and Scherrer, P. H.: 1988, in ‘Advances in Helio- and Asteroseismology’, Proc. IAU Symp. 123, 29.Google Scholar
  7. Kotov, V. A.: 1985, Solar Phys. 100, 101.Google Scholar
  8. Kotov, V. A. and Levitsky, L. S.: 1987, Izv. Krymsk. Astrofiz. Obs. 77, 51.Google Scholar
  9. Kotov, V. A., Severny, A. B., and Tsap, T. T.: 1983, Izv. Krymsk. Astrofiz. Obs. 66, 3.Google Scholar
  10. Kotov, V. A., Severny, A. B., and Tsap, T. T.: 1984a, Mem. Soc. Astron. Ital. 55, 117.Google Scholar
  11. Kotov, V. A., Severny, A. B., and Tsap, T. T.: 1984b, in ‘The Hydromagnetic of the Sun’, ESA SP-220, 189.Google Scholar
  12. Kotov, V. A., Didkovsky, L. V. and Haneychuk, V. I.: 1990, Izv. Krymsk. Astrofiz. Obs. 83 (in press).Google Scholar
  13. Kotov, V. A., Tsap, T. T., and Haneychuk, V. I.: 1990, Solar Phys. (submitted).Google Scholar
  14. Koutchmy, S., Koutchmy, O., and Kotov, V. A.: 1980, Astron. Astrophys. 90, 372.Google Scholar
  15. Pallé, P. L. and Roca Cortés, T.: 1988, in ‘Advances in Helio- and Asteroseismology’, Proc. IAU Symp. 123, 75.Google Scholar
  16. Pinsonneault, M. H., Kawaler, S. D., Sofia, S., and Demarque, P.: 1989, Astrophys. J. 338, 424.Google Scholar
  17. Roxburgh, I. W.: 1974, Nature 248, 209.Google Scholar
  18. Scherrer, P. H. and Wilcox, J. M.: 1983, Solar Phys. 82, 37.Google Scholar
  19. Scherrer, P. H., Wilcox, J. M., Kotov, V. A., Severny, A. B., and Tsap, T. T.: 1979, Nature 277, 635.Google Scholar
  20. Severny, A. B., Kotov, V. A., and Tsap, T. T.: 1976, Nature 259, 87.Google Scholar
  21. Severny, A. B., Kotov, V. A., and Tsap, T. T.: 1980, Astron. Astrophys. 88 317.Google Scholar
  22. Willson, R. G. and Hudson, H. S.: 1988, Nature 332, 810.Google Scholar
  23. Woodard, M. and Hudson, H.: 1983, Solar Phys. 82, 67.Google Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • V. A. Kotov
    • 1
  • T. T. Tsap
    • 1
  1. 1.Crimean Astrophysical ObservatoryNauchny, CrimeaU.S.S.R.

Personalised recommendations