Lunch talk on Jun. 12, 2023

Numerical simulations of solar filaments: formation, magnetic topology and eruption

Speaker: Jinhan Guo (NJU)

Venue: Video Conference

Time: 12:30 PM, Monday, Jun. 12, 2023

Abstract: 

Solar prominences are one of the fascinating phenomena embedded in the solar atmosphere. Their temperature is significantly lower but the density is much higher than the surroundings, and such cold materials are generally supported by sheared arcades or magnetic flux ropes. Moreover, prominences are generally the progenitors of coronal mass ejections (CMEs). Thus, the studies about the prominence can not only enhance our understanding of the fundamental thermodynamics and magnetic structures in astrophysics but also are significant for space weather forecasting. In this talk, we introduce our previous and ongoing studies in terms of prominence formation, magnetic topologies and eruptions. First, we construct flux-rope structures for many prominences with the Regularized Biot-Savart laws (RBSLs) and magneto-frictional methods, and analyze their twisted characteristics. Second, we explore whether the prominence fine structures can manifest differently in weakly-twisted and highly-twisted flux ropes with the pseudo-3D simulation. Third, we study the eruption process with the aid of coronal data-driven simulations, which can capture the formation and eruption of the flux rope, and reproduce some radiative emission structures. In the future, we attempt to extend such coronal data-driven models to the heliosphere, and as the initial and boundary conditions of the global coronal and heliosphere models, which might improve the accuracy of space weather forecasting.

Report PPT:  SWIFAR_Jinhan Guo.pdf