Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/8312
Title: Unraveling the Thermodynamic Enigma between Fast and Slow Coronal Mass Ejections
Authors: Khuntia, Soumyaranjan
Mishra, Wageesh
Mishra, Sudheer K
Wang, Yuming
Zhang, Jie
Lyu, Shaoyu
Keywords: Solar coronal mass ejections
Magnetized plasma
Issue Date: 20-Nov-2023
Publisher: IOP Publishing
Citation: The Astronomical Journal, Vol. 958, No. 1, 92
Abstract: Coronal mass ejections (CMEs) are the most energetic expulsions of magnetized plasma from the Sun that play a crucial role in space weather dynamics. This study investigates the diverse kinematics and thermodynamic evolution of two CMEs (CME1: 2011 September 24 and CME2: 2018 August 20) at coronal heights where thermodynamic measurements are limited. The peak 3D propagation speed of CME1 is high (1885 km s−1 ) with two-phase expansion (rapid and nearly constant), while the peak 3D propagation speed of CME2 is slow (420 km s−1 ) with only a gradual expansion. We estimate the distance-dependent variations in the polytropic index, heating rate, temperature, and internal forces implementing the revised FRIS model, taking inputs of 3D kinematics estimated from the graduated cylindrical shell model. We find CME1 exhibiting heat release during its early-rapid acceleration decrease and jumps to the heat-absorption state during its constant acceleration phase. In contrast to CME1, CME2 shows a gradual transition from the near-adiabatic to the heat-absorption state during its gradually increasing acceleration. Our analysis reveals that although both CMEs show differential heating, they experience heat absorption during their later propagation phases, approaching the isothermal state. The faster CME1 achieves an adiabatic state followed by an isothermal state at smaller distances from the Sun than the slower CME2. We also find that the expansion of CMEs is primarily influenced by centrifugal and thermal pressure forces, with the Lorentz force impeding expansion. Multiwavelength observations of flux-ropes at source regions support the FRISmodel-derived findings at initially observed lower coronal heights.
Description: Open Access, © 2023 The American Astronomical Society, Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. 10.3847/1538-4357/ad00ba
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
URI: http://hdl.handle.net/2248/8312
ISSN: 1538-3881
Appears in Collections:IIAP Publications

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