Other
Scientific paper
Oct 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.505...33w&link_type=abstract
In: SOLMAG 2002. Proceedings of the Magnetic Coupling of the Solar Atmosphere Euroconference and IAU Colloquium 188, 11 - 15 Jun
Other
Solar Prominences, Resonance Polarization, Hanle Effect
Scientific paper
Two-dimensional images of solar prominences in polarized light are obtained at the evacuated Gregory-Coudé telescope on Tenerife. A linear polarization analyzer with CCD camera is placed on the telescope's hour axis. Prominence emission lines are selected by narrow filters of a few Angstrom widths. This set-up allows short exposure times of a few milliseconds yielding spatially very high resolved two-dimensional prominence images in the polarized light. The particular Coudé mounting assures a daily constant instrumental polarization. For zero solar declination near the equinoxia, where the two folding flat mirrors are oriented perpendicular to each other, this polarization largely vanishes. We applied our method to prominence emissions of H-alpha, H-beta and He-D3. The Balmer lines show no linear polarization in excess of the 3×10-4 noise level. For He-D3 we find a linear polarization of a few percent; its relation to the prominence fine-structure is discussed.
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