Abstract
We have obtained empirical relations between the p-mode frequency shift and the change in solar activity indices. The empirical relations are determined on the basis of frequencies obtained from BBSO and GONG stations during solar cycle 22. These relations are applied to estimate the change in mean frequency for the cycle 21 and 23. A remarkable agreement between the calculated and observed frequency shifts for the ascending phase of cycle 23, indicates that the derived relations are independent of epoch and do not change significantly from cycle to cycle. We propose that these relations could be used to estimate the shift in p-mode frequencies for past, present and future solar activity cycles, if the solar activity index is known. The maximum frequency shift for cycle 23 is estimated to be 265±90 nHz, corresponding to a predicted maximum smoothed sunspot number 118.1±35.
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References
Ataç , T.: 1999, private communication.
Bachmann, K. T. and Brown, T. M.: 1993, Astrophys. J. 411, L45.
Bhatnagar, A., Jain, K., and Tripathy, S. C.: 1999, Astrophys. J. 521, 885.
Elsworth, Y., Howe, R., Isaak, G. R., Mcleod, C. P., and New, R.: 1990, Nature 345, 322.
Harvey, J. W.: 1984, in B. La Bonte, G. Chapman, H. Hudson, and R. C. Wilson (eds.), Workshop on Solar Irradiance Variations on Active Region Time Scales, NASA CP-2310; NASA, Washington, p. 197.
Howe, R., Komm, R., and Hill, F.: 1999, Astrophys. J. 524, 1084.
Jain, K., Tripathy, S. C., Kumar, B., and Bhatnagar, A.: 1999, Bull. Astron. Soc. India (in press).
Jiménez-Reyes, S. J., Régulo, C, Pallé, P. L., and Roca Cortés, T.: 1998, Astron. Astrophys. 329, 1119.
Libbrecht, K. G. and Woodard, M. F.: 1990, in Y. Osaki and H. Shibahashi (eds.), Progress of Seismology of the Sun and Stars, Springer-Verlag, Berlin, p. 145.
Pallé. P. L., Régulo, C., and Roca Cortés, T.: 1989, Astron. Astrophys. 224, 253.
Rhodes, E. J., Jr., Cacciani, A., Korzennik, S. G., and Ulrich, R. K.: 1993, Astrophys. J. 406, 714.
Ulrich, R. K.: 1991, Adv. Space Res. 11(4), 217.
Woodard, M. F. and Noyes, R. W.: 1985, Nature 318, 449.
Woodard, M. F., Kuhn, J. R., Murray, N., and Libbrecht, K. G.: 1991, Astrophys. J. 373, L81.
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Jain, K., Tripathy, S., Bhatnagar, A. et al. Empirical estimate of p-mode frequency shift for solar cycle 23. Solar Physics 192, 487–494 (2000). https://doi.org/10.1023/A:1005207921440
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DOI: https://doi.org/10.1023/A:1005207921440