Measurements of Solar Magnetic Element Motion from High‐Resolution Filtergrams

Abstract

Solar photospheric flowfield properties on sub-05 scales are measured using local correlation tracking (LCT) and object tracking of magnetic bright points (MBPs: photospheric bright points associated with magnetic elements). The dataset is a 70 minute time series of cospatial and cotemporal G-band 4305 Å and wideband 4686 Å filtergrams obtained with the 50 cm Swedish Vacuum Solar Telescope on the island of La Palma, Spain. We examine a 29'' × 70'' field of view (FOV) near disk center and compare a 29'' × 29'' magnetic network subfield and a 27'' × 27'' apparently nonmagnetic "quiet-Sun" subfield. The mean time between frames is 23.75 s. Each frame is created by partitioned phase-diverse speckle restoration of three image pairs acquired rapidly in sequence. Angular resolution is ~04 or less in all frames of the restored data set.