PHOTOSPHERIC SHEAR FLOWS ALONG THE MAGNETIC NEUTRAL LINE OF ACTIVE REGION 10486 PRIOR TO AN X10 FLARE

摘要

We optics system, frame selection, and speckle-masking image reconstruction. The data were obtained with the Dunn Solpresent high spatial resolution observations of proper motions in the solar NOAA Active Region 10486 using a high-order adaptive ar Telescope of the National Solar Observatory/Sacramento Peak on 2003 October 29. The resolution of the images approaches the diffraction-limited resolution of the Dunn Solar Telescope of about 0.14″ at 527 nm. We analyzed a 2 hr time series with a 1 minute cadence prior to an X10 white-light flare. Local correlation tracking was used to measure the photospheric proper motions. We find specific evidence of strong shear flows along the magnetic neutral line; these shear flows are well defined and correlated with white-light flare kernels in the visible and infrared. The speed along the flow channels can reach up to 1.6 km s~(-1), and the separation of channels with head-on flows can be less than 1″. Counterstreaming and complex flow patterns have been distinguishing characteristics of this extraordinarily flare-productive active region.