Magnetofrictional Modeling of an Erupting Pseudostreamer

Friday, August 13, 2021

In this study, we present a magnetic conguration of an erupting pseudostreamer observed on April 19, 2015 on the Southwest limb embedding a prominence cavity. The eruption resulted in a relatively wide CME with a round front and prominence core intersected by a sharp plume. In SOHO/LASCO C2, a partial halo was observed. The prominence eruption begins with a slow rise and then evolves to a fast rise phase. We rst construct a non-linear force free eld (NLFFF) model of this erupting pseudostreamer using the ux rope insertion method. The NLFFF model produces the 3D coronal magnetic eld constrained by observed coronal structures and the SDO/HMI photospheric magnetogram taken 3 days earlier. We then increase axial and poloidal ux in the model to make it unstable. The eld congurations representing the eruption are not in force-free equilibrium. We magnetofrictionally evolve the model until the ux rope expands to three solar radii and compare CME propagation with the SOHO/LASCO C2 observations. We perform a topological analysis of the models in order to determine the location of quasi-separatrix layers (QSLs) and how the QSLs location is transferred as the simulation progressed.

3D Magnetic Eld Evolution Erupting Pseudostreamer
3D magnetic eld evolution of an erupting pseudostreamer at 10 000, 70 000, 140 000 and 210 000 iterations. Magnetic eld lines end at 3 Solar radii. Notice the untwisting magnetic eld lines away from the pseudostreamer.
Publication Name: Astrophysical Journal
First HAO Author's Name: Sarah Gibson