Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...186..335l&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 186, no. 1-2, Nov. 1987, p. 335-353. Research supported by the Observatoire de
Astronomy and Astrophysics
Astrophysics
17
Balmer Series, H Alpha Line, H Beta Line, Linear Polarization, Solar Prominences, Line Of Sight, Magnetic Fields, Perturbation Theory
Scientific paper
The linear polarization of H-alpha and H-beta in quiescent prominences having a nonnegligible optical thickness in H-alpha is theoretically deduced, starting from a zero-order self-consistent model obtained by solving the conventional non-LTE problem in prominences. The results show that the fractional linear polarization in zero magnetic field decreases with increasing optical thickness of the prominence and is rotated a small angle with respect to the solar limb when the prominence is seen at a sharp angle with respect to its plane. They also show that the polarization diagrams have a less symmetrical shape with respect to the analogous diagrams obtained for the limiting case of negligible optical thickness.
Bommier Veronique
Landi Degl'Innocenti Egidio
Sahal-Bréchot Sylvie
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