  We investigate the role of active region spicules in the mass balance of the
solar wind and energy supply for heating the solar atmosphere. We use high
cadence observations from the Solar Optical Telescope (SOT) onboard the Hinode
satellite in the Ca II H line filter obtained on 26 January 2007. The
observational technique provides the high spatio-temporal resolution required
to detect fine structures such as spicules. We apply Fourier power spectrum and
wavelet analysis to SOT/Hinode time series of an active region data to explore
the existence of coherent intensity oscillations. The presence of coherent
waves could be an evidence for energy transport to heat the solar atmosphere.
Using time series, we measure the phase difference between two intensity
profiles obtained at two different heights, which gives information about the
phase difference between oscillations at those heights as a function of
frequency. The results of a fast Fourier transform (FFT) show peaks in the
power spectrum at frequencies in the range from 2 to 8 mHz at four different
heights (above the limb), while the wavelet analysis indicate dominant
frequencies similar to those of the Fourier power spectrum results. A coherency
study indicates the presence of coherent oscillations at about 5.5 mHz (3 min).
We measure mean phase speeds in the range 250 to 425 km/s increasing with
height.
