First Results on it P Modes from GOLF Experiment

Details First Results on it P Modes from GOLF Experiment First Results on it P Modes from GOLF Experiment

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997soph..175..227l&link_type=abstract

Solar Physics, Volume 175, Issue 2, pp.227-246

Physics

61

Scientific paper

The GOLF experiment on the SOHO mission aims to study the internal structure of the Sun by measuring the spectrum of global oscillations in the frequency range 10-7 to 10-2 Hz. Here we present the results of the analysis of the first 8 months of data. Special emphasis is put into the frequency determination of the p modes, as well as the splitting in the multiplets due to rotation. For both, we show that the improvement in S/N level with respect to the ground-based networks and other experiments is essential in achieving a very low-degree frequency table with small errors ˜ 2 parts in 10-5). On the other hand, the splitting found seems to favour a solar core which does not rotate slower than its surface. The line widths do agree with theoretical expectations and other observations.

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