Temporal changes in the frequencies and widths of the solar p-mode oscillations

Details Temporal changes in the frequencies and widths of the solar p-mode oscillations Temporal changes in the frequencies and widths of the solar p-mode oscillations

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jphcs.271a2029r&link_type=abstract

Journal of Physics: Conference Series, Volume 271, Issue 1, pp. 012029 (2011).

Physics

1

Scientific paper

We present a study of the temporal changes in the sensitivities of the frequencies and widths of the solar p-mode oscillations to corresponding changes in the levels of solar activity during Solar Cycle 23. From MDI and GONG++ full-disk Dopplergram three-day time series obtained between 1996 and 2008 we have computed a total of 221 sets of m-averaged power spectra for spherical harmonic degrees ranging up to 1000. We have then fit these 221 sets of m-averaged power spectra using our WMLTP fitting code and both symmetric Lorentzian profiles for the peaks as well as the asymmetric profile of Nigam and Kosovichev to obtain 442 tables of p-mode parameters. We then inter-compared these 442 tables which comprise in excess of 5.3 million p-mode parameters, and we performed linear regression analyses of the differences in p-mode frequencies and widths as functions of the differences in as many as ten different solar activity indices. From these linear regression analyses we have discovered new signatures of the frequency shifts of the p-modes and a similar, but slightly different, signature of the temporal shifts in the widths of the oscillations.

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