Polarimetry in the infrared.

Details Polarimetry in the infrared. Polarimetry in the infrared.

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sopo.work..341d&link_type=abstract

Solar Polarimetry, Proceedings of the 11th Sacramento Peak Summper Workshop. Edited by L.J. November. Sunspot, NM: National Sola

Physics

4

Scientific paper

Polarimetry at infrared (IR) wavelengths is advantageous because the larger Zeeman splitting of IR lines results in larger net solar polarization signal. Also, oblique reflections at telescope mirror surfaces have less effect, due to the increase in the index of refraction for Aluminum films at IR wavelengths. Recent developments in IR detector arrays, and the availability of lines formed at altitudes from the deep photosphere (e.g. 1.56 μm Fe I) to the base of the chromosphere (12 μm) represent additional motivation to pursue polarimetry in the IR. Recent measurements using a CdS quarterwave plate and Ge thin-film linear polarizer successfully obtained Stokes I.Q.U. and V profiles of the 12.32 μm Mg I line at high spectral resolution. A significant result from these measurements is the finding that the 12 μm line is essentially 100% polarized in sunspots.

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