|Partial Frequency Redistribution Theory with Paschen-Back Effect: Application to Li I 6708 Å Lines
|526, Solar Polarization Workshop 8
|Sowmya, K.; Nagendra, K. N.; Sampoorna, M.; Stenflo, J. O.
|The diagnostically important Li I D lines in the Second Solar Spectrum are governed
by the quantum interference processes that take place among the magnetic substates belonging to
different fine (J) and hyperfine (F) structure states. This interference gets modified
in the presence of a magnetic field. The signatures of this interference in polarization
contain information on the nature of the vector magnetic field in the solar atmosphere.
With this motivation, we apply the polarized redistribution matrix including Paschen-Back
effect, derived based on the Kramers–Heisenberg scattering matrix approach, to model the
polarization profiles of the Li lines observed in the quiet Sun. We make use of the last
scattering approximation which is based on the concept that the polarization of the
emergent radiation is generated in the last scattering event, before the radiation escapes
from the atmosphere. We present a comparison of the quiet Sun observations of the linear
polarization profiles of Li I 6708 Å line system with the theoretical profiles
computed using our simple modeling approach. We also present theoretical Stokes profiles
in the Paschen-Back regime of magnetic fields and compare them with the single scattered profiles.