Polarimetry in the MG II H and K lines

Details Polarimetry in the MG II H and K lines Polarimetry in the MG II H and K lines

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987soph..111..243h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 111, no. 2, 1987, p. 243-254.

Physics

9

H Lines, K Lines, Linear Polarization, Magnesium, Solar Limb, Ultraviolet Spectra, Circular Polarization, Magnetic Fields, Polarized Radiation, Solar Atmosphere, Solar Maximum Mission, Zeeman Effect

Scientific paper

The Ultraviolet Spectrometer and Polarimeter (UVSP) on the SMM satellite has been used to record the linear polarization profile across the Mg II h and k lines, including its center-to-limb variation. Linear polarization with an orientation of the electric vector parallel to the solar limb is detected in the line wings on the short wavelength side of the k line and on the long wavelength side of the h line, in agreement with theoretical predictions of Auer et al. (1980). The predicted negative polarization (electric vector perpendicular to the limb) between the h and k lines is however not confirmed by the observations. Instead values close to zero are indicated there, although the statistical significance of the results is marginal. Possible explanations of such a discrepancy between theory and observations are examined. After having rejected other alternatives (e.g., opacity effects, different continuum polarization, or deviations from a plane-parallel stratification), it is suggested that the solution may be found in a treatment of partial redistribution of the polarized radiation with the quantum-mechanical interference between the two scattering transitions being included as an integral part of the redistribution problem.

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