Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...257..287t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 257, no. 1, p. 287-297.
Astronomy and Astrophysics
Astronomy
149
P Waves, Solar Oscillations, Astronomical Models, Irradiation, Power Spectra, Solar Convection (Astronomy), Spectral Energy Distribution, Time Series Analysis
Scientific paper
Solar p-modes were observed in irradiance during more than 160 days by the IPHIR experiment on the USSR PHOBOS Mission in 1988. They are characterized by their frequency, splitting, linewidth, and amplitudes, determined by fitting Lorentzians to the lines. Because of the long uninterrupted time series the frequencies are probably the most accurate available at present. They are compared with results from other observations and theoretical models. Very good agreement is observed with a recent standard model, MHD-S2, of Christensen-Dalsgaard (1991), for both the absolute frequencies (less than 3 micro-Hz) and the difference delta (02) = nu(n,0) - nu(n-1,2) (less than 0.15 micro-Hz), which means that the standard solar model is a good approximation to the real sun and that the solution to the 'Neutrino Puzzle' has to be sought from particle physics. From the splittings of the l = 1 and 2 modes the rotation of the core (0.0 - 0.2) is inferred to about 4.6 times the surface rate. The damping of p-modes is determined from the linewidths; lifetimes between 24 and 2 days are found for n = 16...26.
Froehlich Claus
Toutain Thierry
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