研究目的
To investigate structural properties of the coronal current system responsible for producing a solar flare by performing magnetohydrodynamic simulation of an emerging magnetic flux tube which forms a coronal magnetic structure.
研究成果
The flare-producing coronal current system relies on a specific coronal current structure of two-dimensional spatiality, with a sub-region where a nearly anti-parallel magnetic field configuration is spontaneously generated. This configuration plays a key role in causing the reconnection of a three-dimensional magnetic field, a possible mechanism for producing a flare. The twist of a magnetic flux tube significantly affects the structural properties of a coronal current system and the amount of volume current flux carried into the corona.
研究不足
The study focuses on a stand-alone type flare occurring inside an emerging flux tube and does not cover interaction-type flares occurring outside an emerging flux tube when it interacts with a preexisting coronal magnetic field.
1：Experimental Design and Method Selection:
The study involves magnetohydrodynamic (MHD) simulation of an emerging magnetic flux tube to form a coronal magnetic structure. The simulation uses Cartesian coordinates and a modified Lax–Wendroff scheme for investigating viscous, resistive MHD processes in solar phenomena.
2：Sample Selection and Data Sources:
The simulation box covers a domain on the Sun, discretized into grid cells. A cylindrical magnetic flux tube with a radius is placed inside the simulation box, in mechanical equilibrium with a background atmosphere.
3：List of Experimental Equipment and Materials:
The simulation utilizes a computational setup with specific normalization units for length, velocity, time, gas density, gas pressure, temperature, and magnetic field.
4：Experimental Procedures and Operational Workflow:
The simulation is initiated by applying a vertical motion to the flux tube and randomly perturbing the gas pressure for z <
5：Physical quantities are temporally updated by solving MHD equations. Data Analysis Methods:
The study employs fractal dimensional analysis and electric current streamlines to investigate the structuring processes of the coronal current system.
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