Coherent scattering in the solar spectrum - Survey of linear polarization in the range 4200-9950 A

Details Coherent scattering in the solar spectrum - Survey of linear polarization in the range 4200-9950 A Coherent scattering in the solar spectrum - Survey of linear polarization in the range 4200-9950 A

Publishing date

Dec 1983

URL

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...54..505s&link_type=abstract

Journals

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 54, Dec. 1983, p. 505-514.

Science

Astronomy and Astrophysics

Field

Astrophysics

Additional info 2

53

Additional info 3

Coherent Scattering, Linear Polarization, Solar Limb, Solar Spectra, Data Reduction, Fourier Transformation, Line Spectra, Solar Spectrometers

Type

Scientific paper

Abstract

Solar-limb linear polarization observations are reported and discussed. A linearly polarized 4200-9950-A spectrum was obtained using the Fourier-transform spectrometer on the KPNO McMath telescope with an entrance aperture of 10 x 17.5 arcsec centered 10 arcsec inside the solar limb near one of the heliograhic poles, in seven 48-95-min exposures on October 2-3, 1978, and April 27-28, 1979, and recorded using the special modulation scheme described by Brault (1978). The noise level varies from 0.01 to 0.1 percent, and the continuum polarization decreases from over 0.1 percent below 4200 A to less than 0.01 percent above 6000 A. The polarization amplitudes of the clearly significant lines are listed in a table, and the polarization profiles of the most interesting cases are illustrated and discussed. It is shown that the conventional model of dipole and isotropic scattering is contradicted by the observations of fluorescent scattering within and between multiplets and of quantum-mechanical interferences between atomic states with different combinations of total angular momenta.

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