Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self-similar expansion of solar coronal mass ejections: implications for
  Lorentz self-force driving   We examine the propagation of several CMEs with well-observed flux rope
signatures in the field of view of the SECCHI coronagraphs aboard the STEREO
satellites using the GCS fitting method of Thernisien, Vourlidas \& Howard
(2009). We find that the manner in which they propagate is approximately
self-similar; i.e., the ratio ($\kappa$) of the flux rope minor radius to its
major radius remains approximately constant with time. We use this observation
of self-similarity to draw conclusions regarding the local pitch angle
($\gamma$) of the flux rope magnetic field and the misalignment angle ($\chi$)
between the current density ${\mathbf J}$ and the magnetic field ${\mathbf B}$.
Our results suggest that the magnetic field and current configurations inside
flux ropes deviate substantially from a force-free state in typical coronagraph
fields of view, validating the idea of CMEs being driven by Lorentz
self-forces.

8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
19
The categories of this paper are: eess
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
23
The categories of this paper are: solv-int
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom