Solar Flare Burst On A Pair Of Bipolar Current Bands

The solar atmosphere is full of magnetic fields.The more complex the magnetic field structure,the easier it is to store more magnetic energy.When there is too much magnetic energy stored in the magnetic field,energy is released through the solar burst activity,which is a form of solar burst activity.On September 6,2017,at 11:53 UT,an X9.3-level flare broke out on the NOAA AR12673 in the activity area southwest of the sun.Using the vector magnetic map observed by SDO(Solar Dynamics Observatory SDO)/HMI(Helioseismic and Magnetic Imager,HMI),we calculated the apparent current density distribution of the active area at 11:46 UT before the flare burst.The results show that there is a pair of long current bands with opposite polarity current densities of about 0.4?/m~2 near the magnetic neutral line of the active region.SDO/AIA(Atmospheric Imaging Assembly,AIA)found in the EUV and visible light images that a X9.3-level double-band flare broke out at a position corresponding to the current band after about 10 minutes.Surprisingly,the two bright bands of the flare observed in the visible range are just exactly overlapping the two current bands of opposite polarity,and the shape of the flare band is also very similar to the shape of the current band.The flare ring observed in the EUV band covers almost the middle of the two opposite polarity current bands.These correspondences may mean that the explosion of the double-band flare is closely related to the current distribution in the active zone.The position and shape of the current band may be the key factors determining the position and shape of the flare.During flare flares,the current structure in the active zone may release free energy and form a bright flare zone.Since the current band structure before the flare burst can be calculated using the measured vector magnetic field,the correspondence between the flare band and the current structure may provide us with a way to predict the position and shape of the flare burst.The current prediction of the solar flare burst Most rely on the detection of activity zones centered on sunspots,and the physical prediction model of flares has not yet been established.In this paper,using the magnetic field as the starting point,the current the active region is calculated by the method of Ampere's law loop integration.By analyzing the correspondence between the flare band and the current structure,a method for predicting the position and shape of the flare burst is provided.The first chapter of this paper mainly introduces solar activity and solar activity such as flares,dark bars and coronal mass ejections.Chapter 2 introduces the solar magnetic field and current,including the magnetohydrodynamic equations of plasma,magnetic reconnection,and current sheets.Chapter 3 introduces methods related to current calculations.Chapter 4 is our main work,that is,by comparing the flare band of an explosive large flare with the current band about ten minutes before the flare explosion,the correspondence between the flare band and the current structure may provide us with a prediction.The method of flare location and morphology.