Small-scale clusters of photospheric network bright points and their dependence on the solar cycle phase |
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| Authors: | V N Dermendjev R Muller M S Madjarska |
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| Institution: | (1) Institute of Astronomy, Bulgarian Academy of Sciences, 72 Trakia Blvd., 1784 Sofia, Bulgaria;(2) Observatoire du Pic du Midi, 65204 Bagbères de Bigorre, France;(3) Institute of Astronomy, Bulgarian Academy of Sciences, 72 Trakia Blvd., 1784 Sofia, Bulgaria |
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| Abstract: | The tendency of network bright points (NBPs) to form in their surface distribution non-random, small-scale clusters is studied by a 2-D nearest-neighbours test, based on observational data for the distance between separate NBPs. High-resolution photographs taken from long time series obtained at 4308  with the 50-cm refractor of Pic du Midi Observatory are used. Three different epochs of the solar cycle were chosen. The results obtained suggest that the degree of clustering depends on the solar cycle phase. Supposing that the NBPs are good tracers of the kilogauss small-scale magnetic field, we use them to obtain information about the subphotospheric small-scale magnetic field organisation and its dependence on the solar cycle phase. |
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