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Astron. Astrophys. 333, 1130-1142 (1998)
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Theoretical study of the polarization by resonance scattering of the H ![[FORMULA]](img1.gif)
line in spicules
A. de Kertanguy
Laboratoire 'Atomes et Molécules en
Astrophysique', CNRS URA 812 - DAMAp, Observatoire de Paris, Section
de Meudon, F-92195 Meudon, France (Amaury.deKertanguy@obspm.fr)
Received 22 March 1996 / Accepted 16 October 1997
Abstract
One currently observes spicules in the H
line, the underlying photospheric radiation being scattered by the
matter of the spicules. In this paper we solve the equations of
statistical equilibrium for a hydrogen atom having an ensemble
velocity and being illuminated by the photospheric radiation field.
This leads us to the determination of the Stokes parameters
![[FORMULA]](img2.gif)
of the radiation diffused by the spicule towards
the observer. The calculations include fine structure effects, limb
darkening and depolarization by isotropic collisions.
One obtains the linear polarization degree as well as the rotation of the polarization plane as a function of the ascending velocity of matter in spicules.
Key words: line:
formation 
polarization
Sun:
photosphere
Sun: chromosphere
© European Southern Observatory (ESO) 1998
Online publication: April 28, 1998
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