Observed asymptotic properties of low-degree solar gravity-mode eigenfrequencies

The asymptotic properties of the low-degree solar gravity modes are studied in the framework of first- and second-order asymptotic theory predictions. The results of this analysis demonstrate the necessity of retaining the second-order term in asymptotic theory to describe the eigenfrequency spectrum. In this theory, there are two first-order parameters, and two second-order parameters. There remain differences between the asymptotic theory eigenfrequencies and observed eigenfrequencies which are quasi-periodic functions of the radial order n for a given value of the degree l