Coherent scattering in the solar spectrum - Survey of linear polarization in the range 3165-4230 A

Details Coherent scattering in the solar spectrum - Survey of linear polarization in the range 3165-4230 A Coherent scattering in the solar spectrum - Survey of linear polarization in the range 3165-4230 A

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26as...52..161s&link_type=abstract

Astronomy and Astrophysics Supplement Series (ISSN 0365-0138), vol. 52, April 1983, p. 161-180.

Astronomy and Astrophysics

Astrophysics

48

Coherent Scattering, Linear Polarization, Solar Spectra, Data Reduction, Line Spectra, Solar Atmosphere, Solar Limb, Visible Spectrum

Scientific paper

The linear polarization 10 sec of arc inside the solar limb has been recorded over the wavelength range 3165-4230 Å with the vertical spectrograph of the Kitt Peak McMath telescope. This polarization is caused by coherent resonant and fluorescent scattering in the solar atmosphere. The polarization observed in several multiplets of Fe I, as well as in 1Ca II, 3Mg I, and 22Co I, is affected by quantum-mechanical interference between the excited states of different total angular momenta. The CN molecule shows significant polarization, increasing to a maximum at each band head. Unexpectedly large polarization is found among others in 21Ni I, 2Ti II, 1Cu I, as well as in a number of Fe I lines. The continuum polarization increases steeply with decreasing wavelength, and is generally larger than the intrinsic line polarization. Contrary to theoretical expectations, the Balmer jump does not show up in the continuum polarization.

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