Formation Of An Intermediate Filament Driven By Small-Scale Magnetic Reconnection

The study of solar filament has always been one of the hot topics in solar physics research.It is also one of the most special activities in the solar atmosphere.It is a lowtemperature and high-density plasma,but it is suspended in the opposite hightemperature and thin corona.When it is on the edge of the sun,it appears as an object protruding above the chromosphere on the edge of the sun,called a prominence;When in the center of the sun’s surface,it presents a dark slender structure,which is called a filament.The filament is usually located above the polarity reversal line of the magnetic field.On June 5,2020,the filament gradually formed in the NOAA activity area 12675.Based on the outline of the filament formation observed by Global Oscillation Network Group(GONG),we calculated the growth rate of the filament.Through the detection of Helioseismic and Magnetic Imager(HMI)images in the corresponding period,we found that the positive magnetic flux was slowly emerging near the northern footpoint of the filament,which played an important role in the formation of the filament.Secondly,it is very important for the material source of the filament.New Vacuum Solar Telescope(NVST)clearly observed the magnetic reconnection between the filament and the surrounding loop,resulting in the material flowing into the filament from near the northern footpoint of the filament.Because the observation time of NVST is limited,during the period from June 5 to June 8,Atmospheric Imaging Assembly(AIA)304 ? recorded many times of material injection caused by magnetic reconnection.At the same time,we also found the current sheet,the inflow/outflow of plasma,the bright cusp-shaped structure and so on,which provided strong observational evidence for magnetic reconnection.In this paper,the first part is the introduction,which mainly introduces the structure of the sun and its active bodies.The second part mainly introduces the dark bar,including its structure and physical characteristics,the formation and explosion of the dark bar.The third part introduces the telescope related to the solar data.The fourth part is the main work of this paper,that is,by studying the formation process of a dark bar,it analyzes the causes of the formation of the dark bar.The last part is the summary and outlook.