Empirical estimate of p-mode frequency shift for solar cycle 23

Details Empirical estimate of p-mode frequency shift for solar cycle 23 Empirical estimate of p-mode frequency shift for solar cycle 23

1999-12-27

arxiv.org/abs/astro-ph/9912518v1

Solar Phys. 2000, 192, 487

Astronomy and Astrophysics

Astrophysics

Submitted to Solar Physics. Uses Kluwer.sty. Also available at http://www.uso.ernet.in/~sushant

Scientific paper

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 \pm 90 nHz corresponding to the predicted maximum smoothed sunspot number 118.1 \pm 35.

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