  The Interface Region Imaging Spectrograph (IRIS) of the NASA small explorer
mission provides significantly more complete and higher resolution spectral
coverage of the dynamical conditions inside the chromosphere and transition
region (TR) than has heretofore been available. Near the solar limb high
temporal, spatial (0.3") and spectral resolution observations from the
ultraviolet IRIS spectra reveal high-energy limb event brightenings (LEBs) at
low chromospheric heights, around 1 Mm above the limb. They can be
characterized as explosive events producing jets. We selected two events
showing spectra of a confined eruption just off or near the quiet Sun limb, the
jet part showing obvious moving material with short duration large Doppler
shifts in three directions identified as macrospicules on slit-jaw (SJ) images
in Si IV and He II 304 A. The events are analyzed from a sequence of very close
rasters taken near the central meridian and the South pole limb. The processed
SJ images and the simultaneously observed fast spectral sequences having large
Doppler shifts, with a pair of red shifted elements together with a faster blue
shifted element from almost the same position, are analyzed. Shifts correspond
to velocities of up to 100 km/s in projection on the plane of the sky. The
occurrence of erupting spicules and macrospicules from these regions is noticed
from images taken before and after the spectra. The cool low first ionization
potential (FIP) element simultaneous line emissions of the MgII h and k
resonance lines do not clearly show a similar signature due to optical
thickness effects but the Si IV broad-band SJ images do. The bidirectional
plasma jets ejected from a small reconnection site are interpreted as the
result of coronal loop-loop interactions leading to reconnection in nearby
sites.
