Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic Configurations Related to the Coronal Heating and Solar Wind
  Generation I. Twist and Expansion Profiles of Magnetic Loops Produced by Flux
  Emergence   The generation of outflows from the Sun known as solar winds is coupled with
the heating of the solar corona, and both processes are operated in magnetic
structures formed on the Sun. To study the magnetic configuration responsible
for these processes, we use three-dimensional magnetohydrodynamic simulations
to reproduce magnetic structures via flux emergence and investigate their
configurations. We focus on two key quantities characterizing a magnetic
configuration: the force-free parameter alpha and the flux expansion rate fex,
the former of which represents how much a magnetic field is twisted while the
latter represents how sharply a magnetic field expands. We derive distributions
of these quantities in an emerging flux region. Our result shows that an
emerging flux region consists of outer part where a magnetic loop takes a large
flux expansion rate but a small value of alpha at their photospheric
footpoints, and inner part occupied by those loops where a strong electric
current flows. We also investigate the expansion profile of a magnetic loop
composing an emerging flux region. The profile is given by an exponential
expansion type near the solar surface while it is given by a quadratic
expansion type in an outer atmosphere. These detailed magnetic configurations
obtained by this study contribute to developing a realistic model for the
coronal heating and solar wind generation.

17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
15
The categories of this paper are: nucl-ex