Core Field Generation Mechanisms in Flux Transfer Events

One of the outstanding issues regarding flux transfer events / plasmoids is their magnetic structure. Although the detailed physics of the formation and evolution of plasmoids at the magnetopause and in the magnetotail are different, they share some similarities in their magnetic structure. Specifically, they both exhibit a bipolar structure in their magnetic field component perpendicular to the current sheet. Further, the field intensity near the center of FTEs/plasmoids not only does not exhibit a minimum but is often strongly enhanced. In this presentation, we demonstrate, using global MHD and global hybrid codes, different mechanisms for core field generation within FTEs/plasmoids.