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Paper: A Possible Polarization Mechanism of EUV Coronal Lines
Volume: 405, Solar Polarization 5: In Honor of Jan Olof Stenflo
Page: 423
Authors: Manso Sainz, R.; Trujillo Bueno, J.
Abstract: 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 ∼ 107 cm−3 the linear polarization would be ∼1% just over the solar surface and ∼5% at 0.2R, rapidly decaying for Ne > 108 cm−3. The mechanism works for other spectral lines and ions too.
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