Abstract Details


Name: Sunit Sundar Pradhan
Affiliation: Indian Institute of Astrophysics, Bengaluru
Conference ID: TVS202510196
Title: A Revisit to CME Core and Prominence Relation
Authors and Co-Authors: Jayant Joshi, Tanmoy Samanta
Abstract Type: Contributory Presentation
Abstract: Coronal Mass Ejections (CMEs) are large-scale eruption of plasma and magnetic fields from the Sun into interplanetary space. In coronagraph observations, around one-third of CMEs exhibit a characteristic three-part structure consisting of a bright inner core, an outer leading edge (LE), and a darker cavity in the middle. However, observations of the inner corona suggest this three-part structure is more common than previously thought. The traditional view that prominence material forms the bright inner core and that the cavity represents a low-density magnetic flux rope has recently been questioned. Some recent studies propose that the bright core may instead result from the geometric projection of a twisted flux rope. In contrast, more recent observations from the Solar Orbiter in the He II 304~\AA{} passband of the EUI/Full Sun Imager have detected prominence material as far as six solar radii. To reassess the association between prominence material and the bright inner core of CMEs, we analyzed data from Global Oscillation Network Group (GONG) H$\alpha$, Mauna Loa Solar Observatory (MLSO) K-Coronagraph (K-Cor) (white light), and Atmospheric Imaging Assembly (AIA) 304~\AA{} observations, focusing on limb CMEs with visible prominence eruptions in H$\alpha$. Our careful investigation shows a strong correlation between H$\alpha$ and white-light observations of the fine structure of CME cores in the inner corona. In many cases, these structures were further traced into the outer corona within the Large Angle and Spectrometric Coronagraph Experiment (LASCO)/C2 field of view. While this finding lends support to the traditional interpretation to some extent, it does not necessarily rule out alternative perspectives.