  Penumbral filaments and light bridges are prominent structures inside
sunspots and are important for understanding the nature of sunspot magnetic
fields and magneto-convection underneath. We investigate an interesting event
where several penumbral filaments intruded into a sunspot light bridge for more
insights into magnetic fields of the sunspot penumbral filament and light
bridge, as well as their interaction. The emission, kinematic, and magnetic
topology characteristics of the penumbral filaments intruding into the light
bridge and the resultant jets are studied. At the west part of the light
bridge, the intruding penumbral filaments penetrated into the umbrae on both
sides of the light bridge, and two groups of jets were also detected. The jets
shared the same projected morphology with the intruding filaments and were
accompanied by intermittent footpoint brightenings. Simultaneous spectral
imaging observations provide convincing evidences for the presences of magnetic
reconnection related heating and bidirectional flows near the jet bases and
contribute to measuring vector velocities of the jets. Additionally, nonlinear
force-free field extrapolation results reveal strong and highly inclined
magnetic fields along the intruding penumbral filaments, consistent well with
the results deduced from the vector velocities of the jets. Therefore, we
propose that the jets could be caused by magnetic reconnections between
emerging fields within the light bridge and the nearly horizontal fields of
intruding filaments. They were then ejected outward along the stronger
filaments fields. Our study indicates that magnetic reconnection could occur
between the penumbral filament fields and emerging fields within light bridge
and produce jets along the stronger filament fields. These results further
complement the study of magnetic reconnection and dynamic activities within the
sunspot.

Solar and Stellar Astrophysics