Possible creation of net circular polarization and not only depolarization of spectral lines by isotropic collisions

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dc.creatorStepan, Jiri
dc.creatorSahal-Brechot, Sylvie
dc.date2008-11-27
dc.date.accessioned2026-07-07T12:06:14Z
dc.date.available2026-07-07T12:06:14Z
dc.descriptionWe will show that isotropic collisions of electrons and protons with neutral hydrogen can lead to creation of net orientation of the atomic levels in the presence of a magnetic field. Consequently, the emitted Stokes-V profile of the spectral lines can be almost symmetric in contrast to the typical antisymmetric signature of the Zeeman effect. Moreover, the amplitude of the symmetric lobe can be significantly higher than the amplitude of the antisymmetric components. This mechanism is caused by a $\pm{M}$ symmetry breaking of the collisional transitions between different Zeeman sublevels. We will show an example of our first results for the H$α$ line. This new mechanism could perhaps explain the net circular polarization of spectral lines observed in some solar limb observations and which are currently not understood. However, our results are very preliminary and more developments are needed for going further on.
dc.description4 pages, 3 figures, published in Proceedings of the SF2A conference, Paris, 2008
dc.identifierhttps://arxiv.org/abs/0811.4573
dc.identifierhttp://arxiv.org/abs/0811.4573
dc.identifierProc. SF2A 2008, 573-576
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/208595
dc.subjectAstrophysics
dc.titlePossible creation of net circular polarization and not only depolarization of spectral lines by isotropic collisions
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