The Evolution Analysis Of Moving Magnetic Features And Arch Filament Systems

The Sun continuously generates energy, and transfers information outward by electromagnetic radiation etc. According to these limited information, scientists consider from the overall, simplify the details and derivate the information about Sun's energy mechanism, structure and so on. Then they validate the correctness of these results by observations. The researches about the complex huge system of Sun not only have great significances to astronomy and physics but also reflect that the feedback and whole idea of system science are widely used in solar physics.A light bridge in a sunspot is an interesting structure which has been studied for decades, but there still exist a lot of mysteries about its formation, evolution, disappearance and magnetic structure, as well as the relevance to the other solar activity. Moving magnetic features are another kind structure related with sunspots which are described to stream out of sunspot penumbras and move toward the outer boundary of the moat regions. As a kind of basic magnetic elements on the sun, moving magnetic features play a key role in the decay phase of an active region. However, there are still many problems about their formation. All of these important issues related with sunspots are urgent to be resolved. Any effort on investigating the structures related with sunspots, including light bridges and moving magnetic features, would be greatly helpful to understand the mechanisms of solar activity.Arch filament systems (AFSs) are usually considered as the chromospheric manifestations of EFRs seen in Ha observations. It is unknown now that whether AFSs are also associated with moving magnetic features (MMFs) in a sunspot. The possible relation between AFSs and MMFs would be important to reveal the mechanism of building up basic structures on the Sun.Combining the analysis of the Ha observations from NVST and the other multiple-observations from SDO in a sunspot with the active region number of NOAA 11711 on April 1st-4th,2013, it is found that each new MMF emerged from the close vicinity of the northern end of a light bridge, had opposite polarity to that of the sunspot, as well as was always related an arch filament later. The twisting and assembling of these filament fibrils formed AFSs with three main branches. Owing to continual magnetic cancellation between the MMFs and their surrounding opposite flux, the AFSs finally disintegrated?...