  Recently, the characteristics, and dynamics of a persistent 1.7 h vortex
flow, resembling a small-scale tornado, have been investigated with ground-base
and space-based observations and for the first time in the Ha line centre. The
vortex flow showed significant substructure in the form of several intermittent
chromospheric swirls.
  We investigate the oscillatory behaviour of various physical parameters in
the vortex area, with a 2D wavelet analysis performed within the vortex flow
area and in a quiet-Sun region (for comparison), using the same high spatial
and temporal resolution Ha and Ca II 8542 CRISP observations, as well as
Doppler velocities and FWHM derived from the Ha line profiles.
  The vortex flow shows significant oscillatory power in the 3-5 min range that
peaks around 4 min and behaves differently than the reference quiet-Sun region.
Oscillations reflect the cumulative action of different components such as
swaying motions, rotation, and waves. The derived swaying motion periods are in
the range of 200-220 s, and the rotation periods are ~270 s for Ha and ~215 s
for Ca II. Periods increase with atmospheric height and seem to decrease with
radial distance from the vortex centre, suggesting a deviation from a rigid
rotation. The behaviour of power within the vortex flow as a function of period
and height implies the existence of evanescent waves and the excitation of
different types of waves, such as magnetoacoustic (e.g. kink) or Alfven waves.
  The vortex flow seems to be dominated by two motions: a transverse (swaying)
motion, and a rotational motion while oscillations point to the propagation of
waves within it. Nearby fibril-like flows could play an important role in the
rotational modulation of the vortex flow. Indirect evidence exists that the
structure is magnetically supported while the central swirl seems to be acting
as a "central engine" to the vortex flow.
