  To study motions and oscillations in the solar chromosphere and at the
transition region (TR) level we analyze some extreme Doppler shifts observed
off-limb with the Interface Region Imaging Spectrograph (IRIS). Raster scans
and slit-jaw imaging observations performed in the near-ultraviolet (NUV)
channels were used. Large transverse oscillations are revealed by the far wings
profiles after accurately removing the bulk average line profiles of each
sequence. Different regions around the Sun are considered. Accordingly, the
cool material of spicules is observed in Mg II lines rather dispersed up to
coronal heights. In the quiet Sun and especially in a polar coronal hole, we
study dynamical properties of the dispersed spicules-material off-limb using a
high spectral, temporal and spatial resolutions IRIS observations. We suggest
that numerous small-scale jet-like spicules show rapid twisting and swaying
motions evidenced by the large distortion and dispersion of the line profiles,
including impressive periodic Doppler shifts. Most of these events repeatedly
appear in red- and blue-shifts above the limb throughout the whole interval of
the observation datasets with an average swaying speed of order +/-35 kms-1
reaching a maximum value of 50 km s-1 in the polar coronal hole region, well
above the 2.2 Mm heights. We identified for the 1st time waves with a short
period of order of 100 sec and less and transverse amplitudes of order of +/-
20 to 30 km s-1 with the definite signature of Alfven waves. No correlation
exists between brightness and Doppler shift variations; the phase speed of the
wave is very large and cannot definitely be determined from the spectral
features seen along the quasi-radial features. Even shorter periods waves are
evidenced, although their contrast is greatly attenuated by the overlapping
effects along the line of sight.
