Abstract Details

Name: Wageesh Mishra
Affiliation: Max Planck Institute for Solar System Research, Germany
Conference ID: ASI2021_553
Title : Investigating the Thermodynamic State of a Coronal Mass Ejection during its Propagation in the Solar Wind
Authors and Co-Authors : Wageesh Mishra(1), Luca Teriaca(1), Yuming Wang(2), and Jie Zhang(3) (1)Max Planck Institute for Solar System Research, Goettingen, Germany; (2)University of Science and Technology of China, Hefei, China; (3)Department of Physics and Astronomy, George Mason University, Fairfax 22030, USA
Abstract Type : Poster
Abstract Category : Sun and the Solar System
Abstract : Several earlier studies have attempted to estimate the thermodynamic properties of Coronal Mass Ejections (CMEs) either very close to the Sun or at 1 AU. However, our study attempts to investigate the evolution of the thermodynamic state of CMEs during their propagation in the solar wind. For this purpose, we use the flux rope internal state (FRIS) model which is constrained by the kinematics of the CMEs. The kinematics of the CME is estimated using the STEREO coronagraphs (CORs) and heliospheric imagers (HIs) observations in combination with drag based model (DBM) of CME propagation. In our analysis, we have selected a few Earth-directed CMEs which are launched with different speeds into different solar wind conditions. We also attempt to compare the estimated thermodynamic properties of the CMEs from the FRIS model with the in situ observations of the CMEs taken at 1 AU. We focus on estimating the polytropic index of the CME plasma, heating/cooling rate, entropy changing rate, Lorentz force and thermal pressure force acting inside the CME. The talk will discuss the approximations made in our study and the potential reasons of the observed discrepancies between the observations and model derived results.