  G-band bright points (GBPs) are thought to be the foot-points of magnetic
flux tubes. The aim of this paper is to investigate the relation between the
diffusion regimes of GBPs and the associated longitudinal magnetic field
strengths. Two high resolution observations of different magnetized
environments were acquired with the Hinode/Solar Optical Telescope. Each
observation was recorded simultaneously with G-band filtergrams and Narrow-band
Filter Imager (NFI) Stokes I and V images. GBPs are identified and tracked
automatically, and then categorized into several groups by their longitudinal
magnetic field strengths, which are extracted from the calibrated NFI
magnetograms using a point-by-point method. The Lagrangian approach and the
distribution of diffusion indices approach are adopted separately to explore
the diffusion regime of GBPs for each group. It is found that the values of
diffusion index and diffusion coefficient both decrease exponentially with the
increasing longitudinal magnetic field strengths whichever approach is used.
The empirical formulas deduced from the fitting equations are proposed to
describe these relations. Stronger elements tend to diffuse more slowly than
weak elements, independently of the magnetic flux of the surrounding medium.
This may be because the magnetic energy of stronger elements is not negligible
compared with the kinetic energy of the gas, and therefore the flows cannot
perturb them so easily.Yang

Solar and Stellar Astrophysics