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| Paper: |
Tools for 3D Solar Magnetic Field Measurement |
| Volume: |
463, 2nd ATST-EAST Workshop in Solar Physics: Magnetic Fields from the Photosphere to the Corona |
| Page: |
193 |
| Authors: |
Casini, R. |
| Abstract: |
In this paper we describe some of the challenges that solar physicists
face in the application of polarized radiative transfer to the modeling
of the emergent radiation from the outer layers of the solar atmosphere,
where the plane-parallel approximation breaks down, and 3D atmospheric
modeling becomes essential. We review the various plasma conditions
occurring in the photosphere, chromosphere, and corona, which determine
the different regimes of atomic excitation of these regions. Depending
on the relative importance of anisotropic irradiation of the gas over
collisional thermalization of the atomic populations, the description of
the atomic excitation states may necessitate a full quantum-statistical
treatment, which exacerbates the numerical complexity of an already
computationally intensive problem. Special emphasis is placed on forward
modeling and inversion techniques that mitigate this difficulty, making
feasible the interpretation of polarization signals in terms of the
magnetic field and its connectivity throughout the solar atmosphere. |
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