MEASUREMENTS OF SOLAR MAGNETIC ELEMENT MOTION FROM HIGH-RESOLUTION FILTERGRAMS

Solar photospheric flowfield properties on sub-O.'' 5 scales are measu red using local correlation tracking (LCT) and object tracking of magn etic bright points (MBPs: photospheric bright points associated with m agnetic elements). The dataset is a 70 minute time series of cospatial and cotemporal G-band 4305 Angstrom and wideband 4686 Angstrom filter grams obtained with the 50 cm Swedish Vacuum Solar Telescope on the is land of La Palma, Spain. We examine a 29 '' x 70 '' field of view (FOV ) near disk center and compare a 29 '' x 29 '' magnetic network subfie ld and a 27 '' x 27 '' apparently nonmagnetic ''quiet-Sun'' subfield. The mean time between frames is 23.75 s. Each frame is created by part itioned phase-diverse speckle restoration of three image pairs acquire d rapidly in sequence. Angular resolution is similar to 0.'' 4 or less in all frames of the restored data set. From LCT on a 0.'' 4 grid wit h 0.'' 83 FWHM apodization, we find the how speeds to be Rayleigh dist ributed with a mode of 550 m s(-1) and an average of 950 m s(-1) in th e network FOV; in the quiet FOV the modal speed is 700 m s(-1) with a mean of 1100 m s(-1). Within the network FOV, a ''magnetic region'' de fined by the loci of tracked MBPs exhibit even greater alteration: rms contrast of the region is 8% higher in the G band compared to areas o utside, LCT speeds are reduced by a factor of 1.6, and the convective how structures are smaller and much more chaotic. Mesogranulation is e ntirely absent in the magnetic region. The modal and mean speeds of 53 4 tracked MBPs are 300 m s(-1) and 1470 m s(-1) respectively. MBPs spl it and merge with mean times of 320 and 404 s respectively. The mean l ifetime of MBPs in the data set is 9.33 minutes although approximately 5% of the objects can be tracked for the entire 70 minute duration of the time series.