  We present conspicuous activities of plasma ejections along a light bridge of
a stable and mature sunspot in NOAA 8971 on 2000 May 02. We found the ejections
both in the H-alpha (10^4 K) images obtained with the Domeless Solar Telescope
(DST) at Hida Observatory, and in the 171 A (Fe IX/X, ~10^6 K) images obtained
with the Transition Region and Coronal Explorer (TRACE). Main characteristics
of the ejections are as follows: (1)Ejections occur intermittently and
recurrently, (2)The velocities and the timings of the 171 A-ejections are the
same as those of H-alpha ejections, (3)The appearance of ejections are
different from one another, i.e. the H-alpha ejections have jet-like
appearance, while that of 171 A-ejections is like a loop.
