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| Paper: |
Second Spectrum of Na I D1 Observed with THEMIS |
| Volume: |
358, Solar Polarization 4 |
| Page: |
231 |
| Authors: |
Bommier, V.; Molodij, G. |
| Abstract: |
The second solar spectrum (spectrum of the linear polarization observed near the solar limb in a quiet region) of Na I D1 has always been found antisymmetrical when observed with THEMIS (Trujillo Bueno et al. 2001; Bommier & Molodij 2002). The same holds also for atlas of Gandorfer (2000). On the contrary, Stenflo & Keller (1997) and Stenflo, Gandorfer, & Keller (2000) observed a differently shaped profile, showing a central peak. We investigated in depth our treatment of THEMIS data, in particular looking for possible beam misalignments, by observing other unpolarized lines, but we have failed to put in evidence any misalignment. We discuss these complementary observations. In addition, we present a structure in the V/I profile of Na I D1 and D2, which we have repeatedly observed, and which we suggest be due to the Kemp effect (the alignement-to-orientation transfer that occurs in the transition from the Zeeman effect to the Paschen-Back effect). |
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