Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of solar Coronal Mass Ejections: forces that impact their
  propagation   We investigate the Sun-Earth dynamics of a set of 38 well-observed Coronal
Mass Ejections(CMEs) using data from the STEREO, SOHO missions and WIND
instrument. We seek to quantify the relative contributions of Lorentz force and
aerodynamic drag on their propagation. The CMEs are 3D reconstructed using the
Graduated Cylindrical Shell(GCS) model to derive observed CME parameters.Using
a microphysical prescription of the drag coefficient,we find that solar wind
aerodynamic drag adequately accounts for the dynamics of the fastest CMEs from
as low as 3.5 Rs. For relatively slower CMEs, however, we find that when the
drag-based model is initiated below the distances ranging from 12 to 50 Rs,the
observed CME trajectories cannot be accounted for.This suggests that
aerodynamic drag force dominates the dynamics of slower CMEs only above these
heights.To investigate CME dynamics below the heights where aerodynamic drag
dominates, we consider the Torus Instability model for the driving Lorentz
force. We find that for fast CMEs,Lorentz forces become negligible in
comparison to aerodynamic drag as early as 3.5-4 Rs.For slow CMEs, however,
they become negligible only by 12-50 Rs.This justifies the success of the
drag-only model for fast CMEs. In case of slow CMEs, the Lorentz force is only
slightly smaller than the drag force even beyond 12-50 Rs.For these slow
events,our results suggest that some of the magnetic flux carried by CMEs might
be expended in expansion or heating. These dissipation effects might be
important in describing the propagation of slower CMEs. To the best of our
knowledge,this is the first systematic study in this regard using a diverse CME
sample. A physical understanding of the forces that affect CME propagation and
how they compare with each other at various heliocentric distances is an
important ingredient in building tools for describing and predicting CME
trajectories.

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The categories of this paper are: dg-ga
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-bio
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The categories of this paper are: q-fin
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The categories of this paper are: acc-phys
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The categories of this paper are: math-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-th
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The categories of this paper are: chao-dyn
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The categories of this paper are: q-alg