Reporters learned from the Yunnan Observatory of the Chinese Academy of Sciences on the 15th that its researchers have made important progress in detecting small-scale magnetic fields of sun like stars by using astroseismological methods. The relevant research results were published in the international astronomical journal Astrophysical Journal. Magnetic fields are very common and play an important role in modern astrophysics. The observation data from the "Sunrise Satellite" space astronomical observation station shows that there are a large number of small-scale magnetic fields in the quiet area of the surface of the solar photosphere. Numerical simulations show that these small-scale magnetic fields are closely related to turbulent convective motion on the surface of stars, and such magnetic fields are also commonly present in sun like stars. However, due to the distant distance of sun like stars, detecting their small-scale magnetic fields is extremely challenging. Dr. Lin Guifang and others from the Stellar Physics Research Group of Yunnan Observatory have discovered that small-scale magnetic fields form magnetic arches in the upper atmosphere of stars, hindering the propagation of sound waves. This provides the possibility for using asteroseismology methods to detect small-scale magnetic fields in sun like stars. Through theoretical simulations, the research team successfully explained the observational data and determined the small-scale magnetic field strength and magnetic arc junction layer position of the sun like star KIC 8006161. Due to the current controversy over the principle of small-scale magnetic field generation, researchers compared the best fit model of the star with the solar model and found that if the initial helium abundance defined by cosmology is used, except for the depth of the convective zone, the convective velocity and vortex cell size on the surface of the star basically coincide with the solar model, and its small-scale magnetic field strength is very close to that of the sun. In addition, there is a magnetic cavity below the magnetic arc splicing layer, which is consistent with the results of the three-dimensional simulation of magnetohydrodynamics. This successful detection further demonstrates the effectiveness of analyzing the small-scale magnetic field properties on the surface of solar like stars through asteroseismology, "said Lin Guifang. (New Society)