  Chromospheric observations taken at high cadence and high spatial resolution
show a range of spicule like features, including Type I, Type II (as well as
RBEs and RREs) and those which seem to appear within a few seconds, which if
interpreted as flows would imply mass flow velocities in excess of 1000 km/s.
This article seeks to quantify and study rapidly appearing spicular type
events. We also compare the MOMFBD and speckle reconstruction techniques in
order to understand if such spicules are more favourably observed using a
particular technique. We use spectral imaging observations taken with the CRISP
on the Swedish 1 m Solar Telescope. Data was sampled at multiple positions
within the Halpha line profile for both an ondisk and limb location. The data
is host to numerous rapidly appearing features which are observed at different
locations within the Halpha line profile. The feature's durations vary between
10 and 20 s and lengths around 3500 km. Sometimes, a time delay in their
appearance between the blue and red wings of 3 and 5 s is evident, whereas
sometimes they are near simultaneous. In some instances features are observed
to fade and then re emerge at the same location several tens of seconds later.
We provide the first statistical analysis of these spicules and suggest that
these observations can be interpreted as the LOS movement of highly dynamic
spicules moving in and out of the narrow 60 mA transmission filter used to
observe in different parts of the Halpha line profile. The LOS velocity
component of the observed fast chromospheric features, manifested as Doppler
shifts, are responsible for their appearance in the red and blue wings of
Halpha line. Additional work involving data at other wavelengths is required to
investigate the nature of their possible wavelike activity.
