  Reflected sunlight observations from the Ultraviolet Spectrograph (UVS) on
the Juno spacecraft were used to study the distribution of acetylene
(C$_2$H$_2$) at Jupiter's south pole. We find that the shape of the C$_2$H$_2$
absorption feature varies significantly across the polar region, and this can
be used to infer spatial variability in the C$_2$H$_2$ abundance. There is a
localized region of enhanced C$_2$H$_2$ absorption which coincides with the
location of Jupiter's southern polar aurora; the C$_2$H$_2$ abundance poleward
of the auroral oval is a factor of 3 higher than adjacent quiescent,
non-auroral longitudes. This builds on previous infrared studies which found
enhanced C$_2$H$_2$ abundances within the northern auroral oval. This suggests
that Jupiter's upper-atmosphere chemistry is being strongly influenced by the
influx of charged auroral particles and demonstrates the necessity of
developing ion-neutral photochemical models of Jupiter's polar regions.
