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We present G-band and Ca II H observations of NOAA AR 10930 obtained byHinode/SOT on 2006 December 6 covering an X6.5 flare. Local CorrelationTracking (LCT) technique was applied to the foreshortening-corrected G-bandimage series to acquire horizontal proper motions in this complexbeta-gamma-delta active region. With the continuous high quality, spatial andtemporal resolution G-band data, we not only confirm the rapid decay of outerpenumbrae and darkening of the central structure near the flaring neutral line,but also unambiguously detect for the first time the enhancement of the shearedEvershed flow (average horizontal flow speed increased from 330+-3.1 to403+-4.6 m/s) along the neutral line right after the eruptive white-lightflare. Post-flare Ca II H images indicate that the originally fanning out fieldlines at the two sides of the neutral line get connected. Since penumbralstructure and Evershed flow are closely related to photospheric magneticinclination or horizontal field strength, we interpret the rapid changes ofsunspot structure and surface flow as the result of flare-induced magneticrestructuring down to the photosphere. The magnetic fields turn from fanningout to inward connection causing outer penumbrae decay, meanwhile those nearthe flaring neutral line become more horizontal leading to stronger Evershedflow there. The inferred enhancement of horizontal magnetic field near theneutral line is consistent with recent magnetic observations and theoreticalpredictions of flare-invoked photospheric magnetic field change.

Rapid Enhancement of Sheared Evershed Flow Along the Neutral Line Associated with an X6.5 Flare Observed by Hinode