MEASUREMENTS OF SOLAR MAGNETIC ELEMENT MOTION FROM HIGH-RESOLUTION FILTERGRAMS

摘要: Solar photospheric flowfield properties on sub-05 scales are measured using local correlation tracking (LCT) and object of magnetic bright points (MBPs: associated with elements). The dataset is a 70 minute time series cospatial cotemporal G-band 4305 A wideband 4686 filtergrams obtained the 50 cm Swedish Vacuum Telescope island La Palma, Spain. We examine 29'' × 70'' field view (FOV) near disk center compare network subfield 27'' apparently nonmagnetic "quiet-Sun" subfield. mean between frames 23.75 s. Each frame created by partitioned phase-diverse speckle restoration three image pairs acquired rapidly in sequence. Angular resolution ~04 or less all restored data set. From LCT 04 grid 083 FWHM apodization, we find flow speeds to be Rayleigh distributed mode 550 m s-1 an average 950 FOV; quiet FOV modal speed 700 1100 s-1. Within FOV, "magnetic region" defined loci tracked MBPs exhibit even greater alteration: rms contrast region 8% higher G band compared areas outside, reduced factor 1.6, convective structures smaller much more chaotic. Mesogranulation entirely absent region. 534 300 1470 s-1, respectively. split merge times 320 404 s lifetime set 9.33 minutes although approximately 5% objects can for entire duration series.