A Possible Polarization Mechanism of EUV Coronal Lines

Details A Possible Polarization Mechanism of EUV Coronal Lines A Possible Polarization Mechanism of EUV Coronal Lines

Jun 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..405..423m&link_type=abstract

Solar Polarization 5: In Honor of Jan Stenflo ASP Conference Series, Vol. 405, proceedings of the conference held 17-21 Septembe

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Scientific paper

The alignment generated in the ground level of Fe X by scattering in the coronal red line λ6374, can be efficiently transferred by collisions to upper levels; the ensuing spontaneous emission in allowed EUV transitions (as 174.5~Å and 177~Å) is then linearly polarized. The polarization thus generated would be sensitive to the electronic density (Ne) and to the magnetic field orientation although not to the field strength. At Ne˜ 10^7~cm-3 the linear polarization would be ˜1% just over the solar surface and ˜5% at 0.2R_&sun;, rapidly decaying for Ne> 10^8~cm-3. The mechanism works for other spectral lines and ions too.

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