*Astron. Astrophys. 323, 231-234 (1997)*
## 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,
where is the cyclic frequency of an
individual -mode, ,
*P* is a Legendre polynomial, and *N* is the order of the
Legendre expansion provided by the observers. The
are the radial order, angular degree and
azimuthal order of the oscillation, respectively.
We consider the symmetry of the fine structure about the centroid
() 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.
© European Southern Observatory (ESO) 1997
Online publication: June 5, 1998
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