  Our aim is to investigate the intensity oscillations in coronal X-ray Bright
Points (XBPs). We analysed a 7-hours long time sequence of the soft X-ray
images obtained on April 14, 2007 with 2-min cadence using X-Ray Telescope
(XRT) on-board the Hinode mission. We use SSW in IDL to derive the time series
of 14 XBPs and 2 background regions. For the first time, we have tried to use
power spectrum analysis on XBPs data to determine the periods of intensity
oscillations. coronal X-ray Bright Points (XBPs). The power spectra of XBPs
show several significant peaks at different frequencies corresponding to a wide
variety of time scales which range from a few minutes to hours. The light
curves of all the XBPs give the impression that the XBPs can be grouped into
three classes depending on emission levels: (i) weak XBPs; (ii) bright XBPs;
and (iii) very strong XBPs. The periods of intensity oscillation are consistent
in all the XBPs and are independent of their brightness level, suggesting that
the heating mechanisms in all the three groups of XBPs are similar. The
different classes of XBPs may be related to the different strengths of the
magnetic field with which they have been associated.
