  A multi-wavelength photometric analysis was performed in order to study the
sub-structure of a sunspot light bridge in the photosphere and the
chromosphere. Active region NOAA 8350 was observed on 1998 October 8. The data
consist of a 100 min time series of 2D spectral scans of the lines FeI 5576,
H-alpha 6563, FeI 6302.5, and continuum images at 5571. We recorded
line-of-sight magnetograms in 6302.5. The observations were taken at the Dunn
Solar Telescope at U. S. National Solar Observatory, Sacramento Peak. We find
evidence for plasma ejection from a light bridge followed by Ellerman bombs.
Magnetograms of the same region reveal opposite polarity in light-bridge with
respect to the umbra. These facts support the notion that low altitude magnetic
reconnection can result in the magnetic cancellation as observed in the
photosphere.
