Bibcode
DOI
Rabello Soares, M. C.; Roca-Cortés, T.; Jiménez, A.; Appourchaux, T.; Eff-Darwich, A.
Referencia bibliográfica
Astrophysical Journal v.480, p.840
Fecha de publicación:
5
1997
Número de citas
5
Número de citas referidas
4
Descripción
The solar equatorial velocity profile is known down to the base of the
convection zone with high precision (<=1%) from here downward until
approximately 0.5 R&sun;, it seems to be constant, independent of
latitude, and lower than the equatorial surface rate. This result comes
from the inversion of high-l p-mode observations (Thompson et al. 1996),
while low-l p modes, which penetrate deeper, are not measured to the
precision required. Recently, new results from the LOWL instrument on
such modes suggest that deeper down, the rotation rate could be even
slower (Tomczyk, Schou, & Thompson 1995a). Here results from LOI-T,
a low-resolution high-precision photometer, are presented and analyzed
to yield accurate measurements of the frequencies and splittings of
modes with 2 <= l <= 8. The accuracy of the frequency
determinations and the agreement with the best results yielded by low-
and high-l instruments give credit to the results and show its
capability as an intercalibrating tool for experiment. The splittings
found, combined with those of GONG (high-l modes), are used to perform
an inversion of the equatorial rotation profile in the radiative
interior; the result found is that the region from 0.2 <= r/R&sun;
<= 0.4 rotates slower than the surface rate.