Computer Science
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988esasp.286..131l&link_type=abstract
In ESA, Seismology of the Sun and Sun-Like Stars p 131-136 (SEE N89-25819 19-92)
Computer Science
36
Helioseismology, P Waves, Solar Magnetic Field, Solar Oblateness, Solar Rotation, Asphericity, Depth, Inversions, Latitude, Solar Activity Effects
Scientific paper
Measurements of solar p-mode frequency splittings, based on 100 days of solar Doppler observations from Big Bear Solar Observatory are discussed. Because of the long observing run, the splitting measurements have significantly smaller uncertainties than previously published values. Splittings were determined accurately for individual mode multiplets and show a dependence of splitting on radial order n as well as degree l. Two inversions, which infer the solar rotation rate as a function of depth and latitude from the measurements, are also discussed. The two inversions give surprisingly consistent results, and present the following picture of the Sun's internal rotation: (1) The rotation rate in the convection zone is roughly independent of depth, showing a latitudinal differential rotation equal to that seen at the solar surface. (2) There is a relatively sharp transition zone at the base of the convection zone, where the differential rotation in the convection zone gives way to approximately solid body rotation in the radiative interior. The inversions of the data set can provide accurate rotation information only for r/solar radius greater than 0.5. A comparison of the present data set with previous measurements suggests that the even index splitting coefficients change with solar cycle. This time-dependent p-mode frequency splitting is consistent with photometric measurements of the solar limb, which show that the active latitudes on the Sun are significantly hotter than the quiet Sun.
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