Simultaneous Visible and IR spectropolarimetry of the quiet Sun

Bibcode
2005ASSL..320..175D
Domínguez Cerdeña, I.; Sánchez Almeida, J.; Kneer, F.
Bibliographical reference

Solar Magnetic Phenomena, Proceedings of the 3rd Summerschool and Workshop held at the Solar Observatory Kanzelhöhe, Kärnten, Austria, August 25 -- September 5, 2003. Edited by A. Hanslmeier, A. Veronig, and M. Messerotti. Astronomy and Astrophysics Space Science Library, vol. 320, Springer, Dordrecht, The Netherlands, 2005., p.175-178

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0
2005
Number of authors
3
IAC number of authors
1
Citations
0
Refereed citations
0
Description
This work presents the first quiet Sun spectropolarimetric observations carried out in the visible and the infrared (IR) simultaneously. The Fe I lines at 6301.5, 6302.5, 15648, and 15652 Å were observed co-spatially, and at the same time (with a time lag of only 1 minute), with high sensitive spectropolarimeters operated in two different telescopes (VTT and THEMIS at the Observatorio del Teide). We find Stokes V profiles above noise in 30% of the observed area, showing intrinsic magnetic fields of kG (traced by visible lines) co-existing with sub-kG fields (traced by infrared lines). We also found V profiles with opposite polarity in the visible and the IR in 25% of the pixels under study (8% of the area).
Type
Non-refereed

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