2. The solar rotation profile
Through the inversion of LOWL frequency-splitting data spanning 2 years, Charbonneau et al. (1998) have derived the following internal solar rotation rate for :
The observed latitudinal differential rotation is expressed as:
The parameters values are: nHz, nHz, nHz, nHz; is the radius at the bottom of the solar convective zone and the tachocline thickness. Similar expressions can be found in the literature e.g. Li & Wilson (1998), Corbard et al. (1998), Antia et al. (1998). The fact that is almost constant at greater depth is in conflict with earlier predictions of a faster rotating core (Pinsonneault et al. 1989; Zahn 1992), and it rules out that angular momemtum be transported vertically through shear-induced turbulence. But this possibility still exists in the shear flow of the tachocline.
© European Southern Observatory (ESO) 2000
Online publication: January 29, 2001