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Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-4712
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dc.contributor.authorStenflo, J. O.-
dc.contributor.authorGandorfer, A.-
dc.contributor.authorWenzler, T.-
dc.contributor.authorKeller, C. U.-
dc.date.accessioned2018-09-17T12:48:51Z-
dc.date.available2018-09-17T12:48:51Z-
dc.date.issued2001-
dc.identifier.issn0004-6361de_CH
dc.identifier.issn1432-0746de_CH
dc.identifier.urihttps://digitalcollection.zhaw.ch/handle/11475/10656-
dc.descriptionAll A&A articles are in open access one year after their publication date (August 2013).de_CH
dc.description.abstractTo clarify the physical nature of the enigmatic scattering polarization in the Na I D1 and D2 line cores we have explored their behavior with full Stokes vector polarimetry in regions with varying degree of magnetic activity near the solar limb. These observations represent the first time that ZIMPOL II, the second generation of our CCD based imaging polarimeter systems, has been used for a scientific program. With ZIMPOL II the four Stokes images can be demodulated and recorded with a single CCD sensor such that the resulting images of the fractional polarization Q/I, U/I, and V/I are entirely free from spurious features due to seeing or flat-field effects. The polarization in the cores of the lines, in particular in D2, exhibits dramatic and unexpected spatial variations in both Q/I and U/I, including polarization self-reversals of the D2 Q/I core peak. As the fluctuations in the Q, U, and V parameters appear to be relatively uncorrelated, we have parametrized the profiles and made scatter plots of the extracted parameters. Comparison with synthetic scatter plots based on different theoretical models suggests that the polarization signals in the cores of the D2 and D1 lines have different physical origins: While the D1 core is likely to be governed by ground-state atomic polarization, the D2 core is dominated by the alignment of the excited state and by effects of partial frequency redistribution.de_CH
dc.language.isoende_CH
dc.publisherEDP Sciencesde_CH
dc.relation.ispartofAstronomy & Astrophysicsde_CH
dc.rightsLicence according to publishing contractde_CH
dc.subjectPolarizationde_CH
dc.subjectSunde_CH
dc.subjectScatteringde_CH
dc.subject.ddc500: Naturwissenschaftende_CH
dc.subject.ddc530: Physikde_CH
dc.titleInfluence of magnetic fields on the coherence effects in the Na I D1 and D2 linesde_CH
dc.typeBeitrag in wissenschaftlicher Zeitschriftde_CH
dcterms.typeTextde_CH
zhaw.departementSchool of Engineeringde_CH
dc.identifier.doi10.21256/zhaw-4712-
dc.identifier.doi10.1051/0004-6361:20000495de_CH
zhaw.funding.euNode_CH
zhaw.issue3de_CH
zhaw.originated.zhawYesde_CH
zhaw.pages.end1048de_CH
zhaw.pages.start1033de_CH
zhaw.publication.statuspublishedVersionde_CH
zhaw.volume367de_CH
zhaw.publication.reviewPeer review (Publikation)de_CH
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Stenflo, J. O., Gandorfer, A., Wenzler, T., & Keller, C. U. (2001). Influence of magnetic fields on the coherence effects in the Na I D1 and D2 lines. Astronomy & Astrophysics, 367(3), 1033–1048. https://doi.org/10.21256/zhaw-4712
Stenflo, J.O. et al. (2001) ‘Influence of magnetic fields on the coherence effects in the Na I D1 and D2 lines’, Astronomy & Astrophysics, 367(3), pp. 1033–1048. Available at: https://doi.org/10.21256/zhaw-4712.
J. O. Stenflo, A. Gandorfer, T. Wenzler, and C. U. Keller, “Influence of magnetic fields on the coherence effects in the Na I D1 and D2 lines,” Astronomy & Astrophysics, vol. 367, no. 3, pp. 1033–1048, 2001, doi: 10.21256/zhaw-4712.
STENFLO, J. O., A. GANDORFER, T. WENZLER und C. U. KELLER, 2001. Influence of magnetic fields on the coherence effects in the Na I D1 and D2 lines. Astronomy & Astrophysics. 2001. Bd. 367, Nr. 3, S. 1033–1048. DOI 10.21256/zhaw-4712
Stenflo, J. O., A. Gandorfer, T. Wenzler, and C. U. Keller. 2001. “Influence of Magnetic Fields on the Coherence Effects in the Na I D1 and D2 Lines.” Astronomy & Astrophysics 367 (3): 1033–48. https://doi.org/10.21256/zhaw-4712.
Stenflo, J. O., et al. “Influence of Magnetic Fields on the Coherence Effects in the Na I D1 and D2 Lines.” Astronomy & Astrophysics, vol. 367, no. 3, 2001, pp. 1033–48, https://doi.org/10.21256/zhaw-4712.


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