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Astron. Astrophys. 323, 231-234 (1997)

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1. Introduction

The fine structure, or m dependence, in the spectrum of solar oscillations is customarily described by the a -coefficients of Duvall, Harvey and Pomerantz (1986) as,

[EQUATION]

where [FORMULA] is the cyclic frequency of an individual [FORMULA] -mode, [FORMULA], P is a Legendre polynomial, and N is the order of the Legendre expansion provided by the observers. The [FORMULA] are the radial order, angular degree and azimuthal order of the oscillation, respectively.

We consider the symmetry of the fine structure about the centroid ([FORMULA]) frequency. The symmetric part (the odd-a 's) arises from the linear effect of the Sun's rotation. The antisymmetric part (the even-a 's), which is linked to the latitudinal variation of the solar activity, is the subject of this paper.

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© European Southern Observatory (ESO) 1997

Online publication: June 5, 1998

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