Name: Samriddhi Sankar Maity
Affiliation: Indian Institute of Astrophysics and Indian Institute of Science
Conference ID : ASI2022_359
Title : Simulation of solar coronal mass ejections due to twisted flux rope emergence
Authors : Samriddhi Sankar Maity (Indian Institute of Astrophysics, Indian Institute of Science) Piyali Chatterjee (Indian Institute of Astrophysics)
Abstract Type: Poster
Abstract Category : Sun and the Solar System
Abstract : Coronal Mass Ejections (CMEs) can drive interplanetary shocks that energise solar particles and are responsible for the significant space weather effects on Earth. We present a model for the generation and evolution of the coronal mass ejection with a realistic three dimensional magneto-hydrodynamic simulation using the Pencil Code. We have assumed a high-temperature coronal plasma as an ideal gas where magnetic flux rope (MFR) emerging at the lower boundary and pushing a pre-existing coronal potential arcade field. We have found that with the rising of the MFR, its overlying field is strongly stretched and squeezed below the MFR. When the imposed flux emergence at the lower emergence stopped the flux rope settles into a quasi-static rise phase and then begins to accelerate and erupts. At the onset of eruption the centre of the flux rope reaches a height at which the corresponding overlying field declines at a steep rate, consistent with the torus instability of the flux rope. We also observed writhing motion of the MFR so the helical instability is expected to develop in our case. The result imply that, in addition to the torus instability, the writhing motion during the eruption may also play a significant role in our solar eruption simulation.