Analysis of the geometrical features of Photospheric Bright Points in the quiet-sun region

The Solar Granulation is an ubiquitous structure in the quiet photosphere. Many brighter features called “Photospheric Bright Points (PBPs)” are found within inter-granules in G-band images observed. They are the small-scale feature on the solar surface. Studying their characteristics may reveal the significant problems such as coronal hearting, local dynamo theory and the relation of magnetic field. In the presented paper, we utilized Laplacian and morphological dilation (LMD) technique to detect and extract PBPs within inter-granular lanes. A data set has been taken with the Dutch Open Telescope (DOT) on July 2, 2006. It was employed to analyze the geometrical feature of PBPs. Two statistical distributions of PBPs were obtained by the proposed algorithm. The diameter distribution of PBPs is consistent with lognormal statistics. The peak diameter occurs at about 230km. The histogram of geometrical features is derived from the PBPs extracted. The distribution of eccentricity indicates that approximately 50% PBPs have a near circular, the average eccentricity occurs at 1.5. Their distribution accords with an Exponential fit.