Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: First polarimetric measurements and modeling of the Paschen-Back effect
  in CaH transitions   We report the first spectropolarimetric observations and modeling of CaH
transitions in sunspots. We have detected strong polarization signals in many
CaH lines from the A-X system, and we provide the first successful fit to the
observed Stokes profiles using the previously developed theory of the
Paschen-Back effect in arbitrary electronic states of diatomic molecules and
polarized radiative transfer in molecular lines in stellar atmospheres. We
analyze the CaH Stokes profiles together with quasi-simultaneous observations
in TiO bands and conclude that CaH provides a valuable diagnostic of magnetic
fields in sunspots, starspots, cool stars, and brown dwarfs.

32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin