Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333.1130d&link_type=abstract
Astronomy and Astrophysics, v.333, p.1130-1142 (1998)
Astronomy and Astrophysics
Astrophysics
1
Line: Formation, Polarization, Sun: Photosphere, Sun: Chromosphere
Scientific paper
One currently observes spicules in the H{Greekmath 010B} 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 I,Q,U 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.
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