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Recent high resolution spectropolarimetric observations from Hinode detectedthe presence of supersonic downflows in a sunspot light bridge (Louis et al.2009). These downflows occurred in localized patches, close to regions wherethe field azimuth changed by a large value. This apparent discontinuity in thefield azimuth was seen along a thin ridge running along the western edge of thelight bridge. Some, but not all, of these downflowing patches were co-spatialwith chromospheric brightness enhancements seen in Ca II H filtergrams. Thepresence of magnetic inhomogeneities at scales of 0.3 arcsec could facilitatethe reconnection of field lines in the lower chromosphere whose signaturesmight be the supersonic downflows and the brightness enhancements that havebeen observed.

Observations of Supersonic Downflows in a Sunspot Light Bridge as Revealed by Hinode