Spectrum of a random f-mode and the SOHO/MDI data

Details Spectrum of a random f-mode and the SOHO/MDI data Spectrum of a random f-mode and the SOHO/MDI data

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000a%26a...358..343m&link_type=abstract

Astronomy and Astrophysics, v.358, p.343-346 (2000)

Astronomy and Astrophysics

Astrophysics

2

Convection, Sun: Atmosphere, Sun: Granulation, Sun: Oscillations, Turbulence

Scientific paper

According to the SOHO/MDI observations (Duvall et al. 1998, Antia & Basu 1999) the solar f-mode frequency departs from the parabolic dispersion relation omega 2=gk. We propose to explain this behaviour in terms of a space- and time-dependent random flow that occurs in the convection zone. A time-dependent random flow speeds up the f-mode while the effect of a space-dependent random flow is to slow it down. A competition between these two effects brings a reduction of frequencies and a line-width increase at low l. Theoretical estimation of the frequency shift and line-width leads to a conclusion that for l<2000 the results are consistent with the recent SOHO/MDI data.

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