Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986azh....63.1020n&link_type=abstract
Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 63, Sept.-Oct. 1986, p. 1020-1025. In Russian.
Astronomy and Astrophysics
Astronomy
Forbidden Bands, Line Spectra, Linear Polarization, Solar Corona, Solar Magnetic Field, Solar Spectra, Fine Structure, Plasma Spectra
Scientific paper
The problem of the linear polarization of the forbidden coronal lines is considered for the fine-structural inner solar corona. For the plasma densities of the coronal arches observed (ne ≈ 109cm-3 at h ⪉ 0.2 R_sun;) the expected polarization degrees of λ5303 Å Fe XIV and λ10747 Å Fe XIII lines without magnetic field are 0% and ⪉7%, respectively. Therefore the λ5303 Å line is not informative for the purpose of the coronal magnetic field analysis. Polarization measurements of λ10747 Å can provide information on the geometry of the magnetic fields of the inner corona in the plane of the sky if ne < 3×109cm-3. More reliable coronal magnetic field topology can be obtained from the comparison of λ5303 Å pictures and the photospheric magnetic field- and Hα-charts. The polarization observations of the λ5303 Å and λ10747 Å lines combined with λ5303 Å pictures of high spatial resolution can be used for ne diagnostics in the coronal arches.
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