Binal, Patel

Seminar presented at Royal Observatory of Belgium on 2025-11-05

Abstract: Coronal Mass Ejections (CMEs) are large-scale eruptive phenomena originating from the Sun, primarily observed as outward propagating structures in the white-light coronagraph images. The CME occurs in closed magnetic field regions on the Sun such as active regions, filament regions, transequatorial interconnection regions, and complexes involving a combination of these. Exploring the pre-eruption state of the solar sources of CMEs is a key aspect in unveiling the mechanism involved in CME initiation. In this talk, I will present the investigation of three representative class of CME structures at the source regions: (i) magnetic-arc-blowout CMEs driven by homologous compact blowout jets, (ii) a halo CME produced in association with a large two-ribbon flare, (iii) a hot flux rope eruption in association with blowout expansion of overlying coronal loops. By conducting a thorough multi-wavelength imaging and coronal magnetic field modeling, we shed light on the activation and formation of CME structure within the corona. Our studies provide evidence toward the role of large-scale magnetic fields - both closed and open - in channelizing or constraining the CME’s morphological and dynamics evolution at the near-Sun region. Our studies suggest that the configuration of overlying/surrounding coronal loops in the pre-CME phase and their subsequent interactions with the expanding flux rope plays a decisive role in the formation of CME’s large-scale structure.