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We analyze the time series of oxygen line profiles (O vi 1031.93 A and O vi1037.61 A obtained from SUMER/SOHO on the solar south limb. We calculatedDoppler shifts and consequently Doppler velocities in three heights 4", 14",and 24" from the limb on a coronal hole region. Then, we performed waveletanalysis with Morlet wavelet transform to determine the periods of fundamentalmode and its first harmonic mode. The calculated period ratios have departuresfrom its canonical value of $2$. The density stratification and magnetic twistare two main factors which may cause these departures.

Observation of the period ratio P_1/P_2 of transversal oscillations in solar macro-spicules