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An application of the random walk model to proper motions of coronal bright points from SDO data

Atmospheric Imaging Assembly (AIA) images from the Solar Dynamics Observatory (SDO) were used to follow the motions of coronal bright points (CBPs) in the period 1 January - 19 May 2011 with a cadence of 10 minutes. This resulted in a data set of 80966 CBPs with measured lifetimes and mean velocities which were used in a random walk model to calculate the diffusion coefficient, D. The results show that D has a value of ≈260 km^2/s for CBPs with lifetime below 6 hours, decreasing to ≈170 km^2/s for lifetimes above 12 hours, with a mean value of ≈230 km^2/s.

Sun - coronal bright points - random walk - diffusion coefficient - SDO/AIA

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