Abstract Details


Name: Kanika Sharma
Affiliation: Indian Institute of Astrophysics (IIA)
Conference ID: TVS202510129
Title: Two Distinct Coronal Dimming Signatures and Their Recovery in an Off-limb CME Event of 16 July 2024
Authors and Co-Authors: Jayant Joshi, Tanmoy Samanta
Abstract Type: Contributory Presentation
Abstract: Coronal dimmings are observed as reductions in extreme ultraviolet (EUV) emission and soft X-ray (SXR) flux and serve as useful proxies for coronal mass ejections (CMEs). During a CME eruption, closed magnetic field lines open, allowing plasma to escape into the heliosphere. Understanding the properties and evolution of dimmings, therefore, provides key insights into CME initiation, mass loss, and kinematics. Following an eruption, dimming regions gradually recover via plasma refilling and/or temperature increase, processes that are closely linked to coronal mass and energy transport and may have implications for coronal heating. We analyzed an off-limb CME that occurred on 16 July 2024 to investigate dimming and its recovery. Using differential emission measure (DEM) analysis derived from six EUV channels of SDO/AIA, we examined the temperature and emission evolution of the dimming regions. Our preliminary results reveal two distinct dimming behaviors: (1) a diffuse dimming region that reached maximum depletion within the first hour, consistent with CME mass removal, and (2) a structured, loop-like dimming adjacent to it, which continued to deepen for more than six hours. Unlike the diffuse dimming, this loop-like dimming appears less directly connected to CME mass loss and may instead reflect the gradual expansion of pre-existing coronal loops.