Numerical Simulation Of Coronal Disturbance

The sun is a planet closely related to the fate of human beings,so it is necessary for us to study it.The focus of the study of the sun is to study the phenomenon of solar eruption.It occurs all the time in the solar atmosphere,plays the role of generation and release of energy.So it has been a hot point of solar physics study.When the solar burst occurs,high-energy charged plasma and magnetized plasma will cause strong disturbance of the earth's magnetic field and ionosphere,thus affecting the normal activities of human beings on the earth.Due to the limitation of science and technology,human beings have no way to control the sun,but we can learn the specific information by studying the basic characteristics and the internal physical causes of the solar eruption,so that we can take appropriate measures to avoid it.In the process of solar eruptions,scientists often observe Extreme Ultraviolet(EUV)waves propagating around the sun.It is the result of the violent disturbance of the middle and upper atmosphere of the sun caused by the drastic change of the coronal magnetic field construction during the solar eruptions.Therefore,this paper chooses the origin and propagation of EUV wave as the breakthrough point for the future study of the trigger mechanism of solar burst.In this paper,we use the procedure of ZEUS-2D and numerical simulation to study the propagation process of Coronal Mass Ejection(CME)in the background of isothermal atmosphere,and draw the numerical simulation results at each time.Our numerical simulation results show that when the system loses its equilibrium state,the flux rope will start to move up rapidly and generate a shock wave in front of the flux rope.When the shock wave propagates forward,it also expands to the side,thus forming a crescent shape around the flux rope.When the shock wave approaches the bottom boundary,it will generate a return wave.And the return wave will affect the flow of plasma,which will cause the plasma to accumulate behind the echo wave.The first mock exam is very important.Combined with recent research results at home and abroad,we think that this accumulation is one of the important causes of EUV wave formation.In order to improve the efficiency of numerical calculation,we also optimize the numerical algorithm involved in numerical simulation.In this paper,we use the precondition method to optimize the relevant algorithm.We propose a new preconditioned algorithm,which can prove theoretically that the preprocessing can effectively reduce the spectral radius of the matrix.Compared with the previous pre condition processing algorithm,the data experiments show that the method can improve the convergence efficiency of matrix and improve the calculation efficiency of the algorithm.