Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-02-07
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
8 pages, 4 figures; 4th Hinode Science Meeting: Unsolved Problems and New Insights ASP Conference Series, Vol. 455 (2012)
Scientific paper
We investigate the frequency of magnetic activities, namely flux emergence, splitting, merging, and cancellation, through an automatic detection in order to understand the generation of the power-law distribution of magnetic flux reported by Parnell et al. (2009). The quiet Sun magnetograms observed in the Na I line by Hinode/ SOT is used in this study. Investigated patches range from 10^{17}Mx to 10^{19}Mx. Emergence and cancellation are much less frequent than merging and splitting. The time scale for splitting is found to be ~33 minutes and is independent of the flux contained in the splitting patch. Moreover magnetic patches split into any flux contents with an equal probability. It is shown that such a fragmentation process leads to a distribution with a power-law index -2. Merging has a very weak dependence on flux content only with a power-law index -0.33. These results suggest that 1) magnetic patches are fragmented by splitting, merging, and tiny cancellation; 2) flux is removed from the photosphere through tiny cancellations after these fragmentations.
Hagenaar H.
Iida Yasuo
Yokoyama Tadashi
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