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Variations of frequency separations of low-degree p-modes are studied overthe solar activity cycle. The separations studied are obtained from thefrequencies of low-degree p-modes of the Global Oscillation Network Group(GONG). 10.7 cm radio flux is used as an index of solar activity. Smallseparations of the p-mode frequencies are considered to be mainly dependent onthe conditions in stellar interiors. Thus they could be applied to diagnose thechanges in the stellar interior. Our calculation results show that themagnitudes of variations of the mean large separations are less than 1 $\sigma$over the solar activity cycle. Small separations show different behaviors inthe ascending and descending phases of activity. In the ascending phase,variations of the small separations are less than 1 $\sigma$. However, thesmall separations have systematic shifts during 2004 - 2007. The shifts areroughly 1 $\sigma$ or more. The variations of the ratios of the small to largeseparations with time are similar to the changes of the small separations. Theeffects of the changes in the large separations on the ratios are negligible.The variations of the separations may be a consequence of the influence fromthe surface activity or systematic errors in measurements or some processestaking place in the solar interior.

Frequency separation variations of the solar low-degree p-modes