Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Modeling the thermodynamic evolution of Coronal Mass Ejections (CMEs)
  using their kinematics   Earlier studies on Coronal Mass Ejections (CMEs), using remote sensing and in
situ observations, have attempted to determine some of the internal properties
of CMEs, which were limited to a certain position or a certain time. For
understanding the evolution of the internal thermodynamic state of CMEs during
their heliospheric propagation, we improve the self-similar flux rope internal
state (FRIS) model, which is constrained by measured propagation and expansion
speed profiles of a CME. We implement the model to a CME erupted on 2008
December 12 and probe the internal state of the CME. It is found that the
polytropic index of the CME plasma decreased continuously from 1.8 to 1.35 as
the CME moved away from the Sun, implying that the CME released heat before it
reached adiabatic state and then absorbed heat. We further estimate the entropy
changing and heating rate of the CME. We also find that the thermal force
inside the CME is the internal driver of CME expansion while Lorentz force
prevented the CME from expanding. It is noted that centrifugal force due to
poloidal motion decreased with the fastest rate and Lorentz force decreased
slightly faster than thermal pressure force as CME moved away from the Sun. We
also discuss the limitations of the model and approximations made in the study.

22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin