Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The scattering polarization of the Ly-alpha lines of H I and He II
  taking into account PRD and J-state interference effects   Recent theoretical investigations have pointed out that the cores of the
Ly-alpha lines of H I and He II should show measurable scattering polarization
signals when observing the solar disk, and that the magnetic sensitivity,
through the Hanle effect, of such linear polarization signals is suitable for
exploring the magnetism of the solar transition region. Such investigations
were carried out in the limit of complete frequency redistribution (CRD) and
neglecting quantum interference between the two upper J-levels of each line.
Here we relax both approximations and show that the joint action of partial
frequency redistribution (PRD) and J-state interference produces much more
complex fractional linear polarization (Q/I) profiles, with large amplitudes in
their wings. Such wing polarization signals turn out to be very sensitive to
the temperature structure of the atmospheric model, so that they can be
exploited for constraining the thermal properties of the solar chromosphere.
Finally, we show that the approximation of CRD without J-state interference is
however suitable for estimating the amplitude of the linear polarization
signals in the core of the lines, where the Hanle effect operates.

30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
12
The categories of this paper are: nucl-th
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The categories of this paper are: nucl-ex
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
2
The categories of this paper are: math
17
The categories of this paper are: q-fin
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The categories of this paper are: funct-an