Linear polarization of the O VI lambda 1031.92 coronal line. II. Constraints on the magnetic field and the solar wind velocity field vectors in the coronal polar holes
Title | Linear polarization of the O VI lambda 1031.92 coronal line. II. Constraints on the magnetic field and the solar wind velocity field vectors in the coronal polar holes |
Publication Type | Journal Article |
Year of Publication | 2002 |
Authors | Raouafi, N.-E., Sahal-Bréchot S., and Lemaire P. |
Journal | Astronomy and Astrophysics |
Volume | 396 |
Pagination | 1019-1028 |
Date Published | Dec |
Abstract | Numerical computation results of the linear polarization parameters of the O VI lambda1031 .92 coronal line are presented. They are based on theoretical results obtained by Raouafi (2002 and 2000), which give the Stokes parameters of a resonance scattering spectral line sensitive simultaneously to the Hanle effect and to the Doppler redistribution. In the present coronal case, the Hanle effect is due to the coronal magnetic field and the Doppler redistribution to the macroscopic motion of the scattering O$^{5+}$ coronal ions (solar wind velocity field vector). Constraints on the coronal magnetic field vector and on the solar wind velocity field vector are obtained by comparing the numerical results and the linear polarization measurements of the O VI lambda1031 .92 coronal line obtained through particular observations performed by SUMER/SoHO. |
DOI | 10.1051/0004-6361:20021418 |
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